HP StorageWorks XP10000 - Disk Array User manual

HP StorageWorks
Business Copy XP user guide
for the XP10000/XP12000
Part number: T1713-96002
Second edition: December 2005

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Business Copy XP user guide for the XP10000/XP12000

Business Copy XP user guide for the XP10000/XP12000 3
About this guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Prerequisites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Firmware versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Related documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Document conventions and symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
HP technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Subscription service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Helpful web sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1 Business Copy XP (BC) for the XP10000/XP12000 . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Overview of BC operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
BC components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
BC volume pairs (P-VOLs and S-VOLs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Copy Threshold option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Cascade pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
BC software on the Command View XP management station . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
BC requirements for XP12000 and XP10000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maximum number of pairs for the XP10000/XP12000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Calculating the number of differential tables for one BC pair . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Calculating the number of BC pairs if LUSE is not used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Calculating the number of BC pairs if LUSE is used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
BC operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Set reserve attribute operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Reset reserve attribute operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Paircreate operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Initial copy operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Update copy operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Cascade function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Pairsplit operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Copy pace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Split type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Pairresync operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Forward pairresync operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Backward pairresync operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
To avoid any performance impact due to the quick restore operation . . . . . . . . . . . . . . . . . . . . 27
Pair status and time required for pairresync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Pairsplit-E operation (suspend) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Pairsplit-S operation (delete) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
BC options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Swap&Freeze option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Host I/O Performance option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Cascade function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
At-Time Split function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Enabling the At-Time Split function using RAID Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Pair status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Cautions on switching off the power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Cautions on using the XP10000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Preparing for BC operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
System requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Preparing for BC operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Combining BC with other data management operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Combining BC and Continuous Access XP Journal operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Combining BC and Continuous Access XP operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Contents

4
Combining BC with LUN Security XP Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Copying access attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
License capacity of LUN Security XP Extension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Starting BC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
BC main screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Volume list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Detail window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
S-Vol Path window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Display Filter window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Preset Volume list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Performing BC operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Setting reserve attributes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Reserving one or more volumes for use as BC S-VOLs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Resetting reserve attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Unreserving one or more volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Creating BC pairs (Paircreate). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Paircreate Volume List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Copy Pace list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Select MU list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Select S-Vol box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Creating L1 pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Creating L2 pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Splitting BC pairs (Pairsplit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Pairsplit Volume List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Window options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Copy Pace list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Select MU list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Select Split Type list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Select S-Vol box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Splitting pairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Creating and splitting pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Resynchronizing BC pairs (Pairresync) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Pairresync Volume List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Window options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Resynchronizing one or more BC pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Suspending BC pairs (Pairsplit-E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Suspending one or more BC pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Deleting BC pairs (Pairsplit-S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Deleting one or more BC pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Viewing BC pair status and history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Setting BC options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Setting a BC option (Swap&Freeze option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
BC error codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
A Maximum pair calculations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Calculating the maximum number of Flex Copy XP copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Calculating the required number of differential tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Calculating the number of pairs you can create. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
If LUSE is not used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
If LUSE is used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Calculating the number of Auto LUN XP concurrent migration plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Calculating differential tables for mainframe volume migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Calculating differential tables for open-system volume migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figures
1 BC overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Business Copy XP user guide for the XP10000/XP12000 5
2 Adding a pair in BC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3 Update copy operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4 Normal and quick pairresync operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5 Reverse and quick restore pair operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6 BC P-VOL forming pair with Continuous Access XP S-VOL and external S-VOL, respectively. . . . . . . . . 28
7 BC P-VOL forming pair with external S-VOL and shared as Continuous Access XP S-VOL . . . . . . . . . . 28
8 BC S-VOL forming pair with external P-VOL and shared as Continuous Access XP P-VOL. . . . . . . . . . . 28
9 BC P-VOL forming pair with Continuous Access XP Journal S-VOL and External S-VOL, respectively . . . 28
10 BC P-VOL forming pair with external S-VOL and shared as Continuous Access XP Journal S-VOL . . . . . 28
11 Quick Restore operation with or without Swap&Freeze option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
12 Cascade pairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
13 Overview of At-Time Split function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
14 BC pair status transitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
15 BC and
Continuous Access XP Journal: Shared P-VOL and P-VOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
16 BC and
Continuous Access XP Journal: Shared P-VOL and S-VOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
17 BC and
Continuous Access XP Journal: Shared P-VOL and P-VOL and P-VOL and S-VOL . . . . . . . . . . . . . 42
18 BC and
Continuous Access XP: shared P-VOL/P-VOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
19 BC and
Continuous Access XP: shared P-VOL/S-VOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
20 BC and
Continuous Access XP: shared P-VOL/P-VOL and P-VOL/S-VOL. . . . . . . . . . . . . . . . . . . . . . . . 43
21 BC and
Continuous Access XP: shared S-VOL/P-VOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
22 BC, Continuous Access XP Journal, and Continuous Access XP: Shared S-VOL/P-VOL/S-VOL . . . . . . . 44
23 BC, Continuous Access XP, and Continuous Access XP Journal: Shared S-VOL/P-VOL/S-VOL . . . . . . . 45
24 Copying access attribute. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
25 Required license capacity for LUN Security XP Extension when using cascade function . . . . . . . . . . . . 48
26 BC main screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
27 Volume list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
28 Detail window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
29 S-Vol Path window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
30 Display Filter window (BC tab selected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
31 Preset Volume list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
32 Set Reserve Attribute window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
33 Reset Reserve Attribute window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
34 Paircreate window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
35 Pairsplit window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
36 Pairresync window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
37 Pairsplit-E window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
38 Pairsplit-S window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
39 History pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
40 Option screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Tables
1 Recommended and minimum firmware versions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Document conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 BC operational requirements for XP12000 and XP10000. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Total number of differential tables per pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Number of control cylinders according to emulation types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Relationship between emulation type, capacity, and differential tables . . . . . . . . . . . . . . . . . . . . . . . . 18
7 Number of differential tables used in OPEN-V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Read/write operations during pairsplit operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Requirements for reverse or quick restore pairresync operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10 BC options types and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11 Relationship between L1 pair status and L2 pair operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
12 Relationship between L2 pair status and L1 pair operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
13 Read/write operation (host to the node volume) and L1/L2 pair status . . . . . . . . . . . . . . . . . . . . . . . . 34
14 Read/write operation (host to the leaf volume) and L2 pair status . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
15 BC pair status conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
16 Identifying the volumes for BC operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
17 Access attribute and availability as a BC pair volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
18 Availability of BC operations on volumes with the S-VOL Disable attribute. . . . . . . . . . . . . . . . . . . . . . 45

6
19 VMA setting and availability of Paircreate operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
20 Pair status and availability of LUN Security XP Extension operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
21 BC tree icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
22 Status icons for BC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
23 BC operations shortcut menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
24 BC pair activity codes, messages, and descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
25 BC error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
26 Control cylinders by emulation type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
27 Total number of differential tables per migration plan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
28 Control cylinders by emulation type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Business Copy XP user guide for the XP10000/XP12000 7
About this guide
This guide provides information about the following:
•”Overview of BC operations” on page 11”
•”Preparing for BC operations” on page 39
•”Starting BC” on page 48
•”Performing BC operations” on page 57
•”BC error codes” on page 73
Intended audience
This guide is intended for customers and HP-authorized service providers with knowledge of the following:
•Disk array hardware and software
•Data processing and RAID storage subsystems and their basic functions
Prerequisites
Prerequisites for using this product include:
•Installation of the HP StorageWorks disk array(s)
•Installation of the license key for this product
Firmware versions
The recommended firmware versions shown below provide the optimal level of support for the features
provided with this product. Older firmware versions can be used; however, product features enabled with
newer firmware will not appear.
Table 1 Recommended and minimum firmware versions
Related documentation
In addition to this guide, please refer to other documents for this product:
•HP StorageWorks Command View XP user guide for XP Disk Arrays
•HP StorageWorks XP Remote Web Console user guide for XP12000/XP10000
•HP StorageWorks Snapshot XP user guide
•HP StorageWorks LUN Configuration and Security Manager XP user guide for the XP10000/XP12000
•HP StorageWorks LUN Security XP Extension user guide
•HP StorageWorks RAID Manager XP user guide
• Hitachi ShadowImage for z/OS user guide
•HP StorageWorks External Storage XP user guide
•HP StorageWorks Performance Control XP user guide
•HP StorageWorks Flex Copy XP user guide
You can find these documents at http://www.hp.com/support/rwc/manuals.
XP disk array Minimum Recommended
XP12000 50-04-31-00/00 50-04-41-00/00 or later
XP10000 50-04-31-00/00 50-04-41-00/00 or later

8
Document conventions and symbols
CAUTION: Indicates that failure to follow directions could result in damage to equipment or data.
IMPORTANT: Provides clarifying information or specific instructions.
NOTE: Provides additional information.
TIP: Provides helpful hints and shortcuts.
HP technical support
Telephone numbers for worldwide technical support are listed on the HP support web site:
http://www.hp.com/support/.
Collect the following information before calling:
•Technical support registration number (if applicable)
•Product serial numbers
•Product model names and numbers
•Applicable error messages
•Operating system type and revision level
•Detailed, specific questions
For continuous quality improvement, calls may be recorded or monitored.
Table 2 Document conventions
Convention Element
Blue text: Table 1 Cross-reference links and e-mail addresses
Blue, underlined text:
(http://www.hp.com)
Web site addresses
Bold text •Keys that are pressed
•Text typed into a GUI element, such as a box
•GUI elements that are clicked or selected, such as menu and list
items, buttons, and check boxes
Italic text Text emphasis
Monospace text •File and directory names
•System output
•Code
•Commands, their arguments, and argument values
Monospace, italic text •Code variables
•Command variables
Monospace, bold text Emphasized monospace text

Business Copy XP user guide for the XP10000/XP12000 9
Subscription service
HP strongly recommends that customers register online using the Subscriber's choice web site:
http://www.hp.com/go/e-updates.
Subscribing to this service provides you with e-mail updates on the latest product enhancements, newest
driver versions, and firmware documentation updates as well as instant access to numerous other product
resources.
After subscribing, locate your products by selecting Business support and then Storage under Product
Category.
Helpful web sites
For additional information, see the following HP web sites:
•http://www.hp.com
•http://www.hp.com/go/storage
•http://www.hp.com/support
•http://www.hp.com/support/rwc/manuals

10

Business Copy XP user guide for the XP10000/XP12000 11
1 Business Copy XP (BC) for the XP10000/XP12000
HP StorageWorks Business Copy XP (BC) maintains internal copies of user data on disk arrays for
purposes such as data backup or duplication. Duplicate volumes are created on the same disk array as the
primary volume at hardware speeds. BC is used for UNIX and PC server data, and can provide up to nine
duplicates of one primary volume.
This chapter provides instructions for performing BC operations using Command View XP or XP Remote
Web Console.
NOTE: See the HP StorageWorks Command View XP Advanced Edition Device Manager Web Client
user guide for instructions on accessing Business Copy from Command View XP Advanced Edition.
BC operations are nondisruptive and allow the primary (main) volume of each volume pair to remain
online to all hosts for read and write I/O operations.
After establishing operations, BC operations continue unattended to provide asynchronous internal data
backup. Usability is further enhanced through a resynchronization capability that reduces data duplication
requirements and backup time, thereby increasing user productivity. BC also supports reverse
resynchronization.
You can perform BC operations in conjunction with HP StorageWorks Continuous Access XP operations to
provide additional remote copies of BC volumes. BC also supports the disk array’s custom volume size
(CVS) and Cache LUN features, ensuring that BC operations can duplicate all user data. See ”Combining
BC with other data management operations” on page 40 for further information on combining BC with
other data management features.
You can also perform BC operations with External Storage XP operations to create pairs with external
volumes.
Overview of BC operations
BC is a storage-based hardware solution for duplicating logical volumes that reduces backup time and
provides point-in-time backup. BC primary volumes (P-VOLs) contain original data; BC secondary volumes
(S-VOLs) contain duplicate data. You can use the BC cascaded volume function to make up to nine copies
of each P-VOL. Because each S-VOL is paired with its P-VOL independently, each S-VOL can be maintained
as an independent copy set that can be split, resynchronized, and deleted separately from other S-VOLs
assigned to the same P-VOL.
BC components
BC operations on the Command View XP management station or XP Remote Web Console involve primary
and secondary volumes in the disk array. Figure 1 shows a typical BC configuration. BC system
components are:
•”BC volume pairs (P-VOLs and S-VOLs)” on page 12

12 Business Copy XP (BC) for the XP10000/XP12000
•”BC software on the Command View XP management station” on page 13
Figure 1 BC overview
Use BC from the Command View XP management station or XP Remote Web Console to copy volumes in
the local disk array. The volume that has original data is called a P-VOL (primary volume), and a volume to
which data is copied is called an S-VOL (secondary volume). Pairs of P-VOLs and S-VOLs made by BC are
called BC pairs. You can specify an S-VOL as a P-VOL to make another two BC pairs. As a result, you can
use BC to make a total of nine S-VOLs. Use the cascade style to make BC pairs by specifying S-VOLs as
P-VOLs. In cascade style, pairs in the first cascade layer are called L1 pairs and pairs in the second
cascade layer are called L2 pairs.
BC volume pairs (P-VOLs and S-VOLs)
Disk arrays contain and manage original and copied BC data. The XP128/XP1024 disk arrays support a
maximum of 8,190 BC volumes: 4,095 pairs and the RAID Manager command device. The XP12000 disk
array supports a maximum of 16,382 BC volumes (8,191 pairs: 8,191 P-VOLs and 8,191 S-VOLs). When
BC pairs include size-expanded LUs, the maximum number of pairs decreases. When pairs include more
than one S-VOL, the maximum number of P-VOLs decreases.
BC performs internal copy operations for logical volume pairs that you establish. Each BC pair consists of
one primary volume (P-VOL) and up to three secondary volumes (S-VOLs) located in the same disk array.
BC P-VOLs are primary volumes containing original data. BC S-VOLs are secondary or mirrored volumes
containing backup data. Each S-VOL must be paired with only one P-VOL. During BC operations, P-VOLs
remain available to all hosts for read and write I/O operations (except during reverse resync and quick
restore). S-VOLs become available for host access only after the pair is split.
When a BC volume pair is created, data on the P-VOL is copied to the S-VOL to synchronize the volumes.
During this initial copy operation and after the pair is synchronized, all write operations to the S-VOL are
prohibited. To access an S-VOL, you can “split” the pair to make the S-VOL accessible (the P-VOL is
accessible except during reverse resync). While a BC pair is split, the disk array keeps track of all changes
to the P-VOL and S-VOL. When you “resync” the pair, the differential data in the P-VOL (due to P-VOL and

Business Copy XP user guide for the XP10000/XP12000 13
S-VOL updates) is copied to the S-VOL, so the S-VOL is again identical to the P-VOL. For reverse resync, the
differential data in the S-VOL (due to P-VOL and S-VOL updates) is copied to the P-VOL, so the P-VOL is now
identical to the S-VOL.
NOTE: BC S-VOLs are updated asynchronously. For a volume pair with PAIR status, the P-VOL and S-VOL
may not be identical. For further information on BC update copy operations, see ”Paircreate operation” on
page 21.
BC P-VOLs or S-VOLs should not be concentrated in the same RAID group. To disperse workloads of RAID
groups, each RAID group should have both P-VOLs and S-VOLs evenly distributed. BC pairs for which BC
operations are performed simultaneously should be in different RAID groups. If BC pairs are concentrated
in only a few RAID groups, host I/O performance may be degraded.
If the disk array is overloaded, increase cache, disk adapters, and/or RAID groups. Consider assigning
BC S-VOLs in newly installed RAID groups. If you continue BC operations with an overloaded disk array,
host I/O performance may be degraded.
Copy Threshold option
If BC performs copy operations when the disk array workload is heavy, host server I/O performance might
be degraded. To minimize this performance degradation, enable Copy Threshold, which temporarily stops
all BC copy operations when the disk array has a heavy workload. Copy operations that are stopped by
the Copy Threshold option resume when the disk array workload is lighter.
This option is different from the Host I/O Performance option (”Host I/O Performance option” on
page 31), because it is effective only when the disk array workload is heavy.
NOTE: Contact your HP support account representative for more information about the Copy Threshold
option.
In addition to BC operations, Copy Threshold temporarily stops copy operations for the following
applications when the disk array workload is heavy:
•Auto LUN XP
•ShadowImage for z/OS
•Hitachi FlashCopy Mirroring
•Hitachi FlashCopy Mirroring Version 2
•Snapshot XP
•Flex Copy XP
Cascade pairs
The BC cascade function adds a second layer of pairs onto the first layer of original BC pairs. Use these
two layers of pairs (L1 and L2) to create and maintain up to nine copies of one original BC primary volume
(P-VOL). See ”Cascade function” on page 31 for further information on the cascade function.
BC software on the Command View XP management station
When installed on the Command View XP management station, the BC software displays BC information
and performs BC operations. The Command View XP management station can be attached to multiple disk
arrays. The Command View XP management station acquires status from and issues commands to BC
P-VOLs and S-VOLs.

14 Business Copy XP (BC) for the XP10000/XP12000
BC requirements for XP12000 and XP10000
BC operations provide disk array-internal copies of UNIX/PC server volumes (LUs) on the disk array. The
following table describes the operational requirements for BC.
Table 3 BC operational requirements for XP12000 and XP10000
Parameter Requirement
Pair objects Logical devices (LDEVs): OPEN-x (such as OPEN-3, OPEN-9, OPEN-E, and OPEN-V),
including CVS and LUSE volumes. Devices must be installed and configured. The
P-VOL and S-VOL must be the same type (for example, OPEN-3 to OPEN-3 is allowed,
OPEN-3 to OPEN-9 is not allowed).
A custom size P-VOL must be paired with S-VOLs of the same type and capacity. A
LUSE P-VOL must be paired with S-VOLs of the same size and structure. For example, if
a LUSE P-VOL is connected to volumes of 1GB, 2GB, and 3GB in this order, you must
specify the LUSE volume that has exactly the same size and connection order as the
S-VOL.
BC does not support multiplatform devices (for example, 3390-3A, -3B, -3C).
Snapshot XP pairs, virtual volumes, and pool volumes cannot be specified as P-VOLs
or S-VOLs.
Journal volumes for HP StorageWorks Continuous Access XP Journal cannot be
specified as P-VOLs or S-VOLs.
Volumes that form a Flex Copy XP pair cannot be specified as P-VOLs. A Flex Copy XP
P-VOL can be specified as a Business Copy XP S-VOL under certain conditions. Refer
to the HP StorageWorks Flex Copy XP user guide for more information.
BC operations can be performed with External Storage XP operations to create pairs
that use the external volumes as BC S-VOLs (or mirroring volumes) under the same
conditions applied to the volumes in the local disk array. Refer to the HP StorageWorks
External Storage XP user guide for more information.
Number of copies Maximum of three copies (S-VOLs) per primary volume (P-VOL). Maximum of one
P-VOL per S-VOL (P-VOLs cannot share an S-VOL).
An additional six copies can be created by using the BC cascade function.
Maximum number of
pairs1A maximum of 8,192 pairs (8,192 P-VOLs and 8,192 S-VOLs) can be created per
disk array.
NOTE: The maximum number of pairs equals the total number of BC, Snapshot XP,
ShadowImage for z/OS, Hitachi FlashCopy Mirroring, Hitachi FlashCopy Mirroring
Version 2, Auto LUN XP, and Flex Copy XP volume pairs.
When you use RAID Manager, the maximum number of BC pairs is 8,191 (8,191
P-VOLs and 8,191 S-VOLs).
If some BC pairs contain LUSE volumes, or if an application other than BC is used, the
maximum number of BC pairs might be less than 8,192 (or 8,191).
Refer to ”Maximum number of pairs for the XP10000/XP12000” on page 15 for
information about calculating the maximum number of BC pairs.
Maximum number of
S-VOLs
8,192 (8,191 if RAID Manager is used).
MU (mirror unit) numbers
of cascade pairs
L1 pairs = 0, 1, and 2 (a total of 3 pairs)
L2 pairs =1 and 2 (a total of 2 pairs)
Combinations of RAID
levels (primary-
secondary)
All combinations supported: RAID1-RAID1, RAID5-RAID5, RAID6-RAID6,
RAID1-RAID5, RAID1-RAID6, RAID5-RAID1, RAID5-RAID6, RAID6-RAID1,
RAID6-RAID5.

Business Copy XP user guide for the XP10000/XP12000 15
Maximum number of pairs for the XP10000/XP12000
When you create BC pairs, resources called differential tables are required. The number of differential
tables available in one disk array depends on the array’s amount of shared memory for differential tables.
•You can use 13,652 differential tables if no additional shared memory for differential tables is
installed.
•You can use 30,718 differential tables if additional shared memory for differential tables is installed.
NOTE: Contact your HP account support representative for more information about adding additional
shared memory.
NOTE: The maximum number of pairs you can create is 8,192, no matter how much shared memory for
differential tables is available. If a command device is installed in order to use RAID Manager, the
maximum number of pairs is 8,191 (when configuring pairs of 1 P-VOL: 1 S-VOL ratio).
To calculate the maximum number of BC pairs, you must calculate how many differential tables are
required to create BC pairs, and compare the result with the number of differential tables in the disk array.
The following applications also use differential tables:
•ShadowImage for z/OS
•Hitachi FlashCopy Mirroring
Dynamic sparing and
automatic correction copy
If a failure occurs requiring the disk array to utilize dynamic sparing or automatic
correction copy, the status of the paired volumes associated with the failed physical
device is not affected.
Physical device (PDEV)
maintenance
Maintenance of a PDEV that is not used by BC does not affect BC operations or the
status of BC pairs. If a PDEV contains LDEVs used by BC, you can maintain that PDEV
independently of the BC operations and pair status.
Logical device (LDEV)
maintenance
If the status of a BC pair is COPY(PD), PAIR, PSUS, PSUS(SP), COPY(SP), COPY(RS), or
COPY(RS-R), maintenance for the LDEVs used by that pair is restricted. Maintenance is
also restricted for LDEVs with the Reserve attribute.
To maintain these LDEVs, suspend or delete the BC pair, or reset (unreserve) the
Reserve attribute.
Cache maintenance If disk array cache maintenance is performed during a period of high I/O usage, one
or more BC pairs may be suspended. Reduce the I/O load before cache
maintenance.
Point-in-time backup For pairs in PAIR status, host I/Os are copied to S-VOLs asynchronously. To
synchronize a pair and access the S-VOL as soon as possible, vary the P-VOL offline
and split the pair before using the S-VOL. If the P-VOL cannot be taken offline, a P.I.T.
backup still occurs if a pairsplit is issued. When all data on the P-VOL (up to the
pairsplit time) is copied to the S-VOL, the pair is split and the S-VOL becomes
available for use (R/W). The operation may take longer to complete if high write
activity from the host to the P-VOL is occurring. A P.I.T. backup can also be performed
by issuing a pairsplit to P-VOLs in the SMPL (simplex) state.
Failures When a failure of any kind prevents a BC copy operation from completing, the disk
array suspends the pair. If an LDEV failure occurs, the disk array suspends the pair. If
a PDEV failure occurs, BC pair status is not affected because of the RAID architecture,
but copy pace may be degraded.
Maintenance/upgrade Under certain conditions, BC volume pairs may need to be re-established.
1. Maximum number of pairs per disk array depends on installed firmware version.
Table 3 BC operational requirements for XP12000 and XP10000 (continued)
Parameter Requirement

16 Business Copy XP (BC) for the XP10000/XP12000
•Hitachi FlashCopy Mirroring version 2
•Flex Copy XP
•Auto LUN XP
•Snapshot XP
For more information, refer to the following documents:
•For ShadowImage for z/OS, Hitachi FlashCopy Mirroring, and Hitachi FlashCopy Mirroring Version
2, see the Hitachi ShadowImage for z/OS user guide.
•For Flex Copy XP, see ”Calculating the maximum number of Flex Copy XP copy pairs” on page 79.
•For Auto LUN XP, see ”Calculating the number of Auto LUN XP concurrent migration plans” on
page 80.
•For Snapshot XP, see the HP StorageWorks Snapshot XP user guide.
If BC is used in the same disk array as any of these applications, the number of available differential tables
for BC pairs is the number of differential tables in the disk array minus the number of differential tables
used by other applications.
If only BC uses differential tables, the following section describes how to calculate the number of
differential tables required for one BC pair, and the conditions you need to consider when calculating the
number of BC pairs that you can create.
NOTE: You can use RAID Manager’s inqraid command to query the number of differential tables
required when you create BC pairs. You can also use this command to query the number of unused
differential tables in the disk array. For more information about the inqraid command, see the
HP StorageWorks RAID Manager XP user guide.

Business Copy XP user guide for the XP10000/XP12000 17
Calculating the number of differential tables for one BC pair
When you create a BC pair, the number of required differential tables changes according to the emulation
type of the volumes. Use the equations in Table 4 to calculate the total number of differential tables per
pair.
Table 4 Total number of differential tables per pair
Emulation type Equation
OPEN-3 Total number of differential tables per pair =
(X): Volume capacity (KB) 1,2
(Y): Number of control cylinders associated with the emulation type (see Table 5)
(Z): Number of slots that can be managed by a differential table (61,312)
NOTE: Round the result of the calculation up to the nearest whole number.
For example, if the volume’s emulation type is OPEN-3, and it is not a custom volume, the
volume capacity (X) is the default volume size, 2,403,360 KB, and total number of differential
tables is calculated as follows:
When you round to the nearest whole number, the result is 1. Therefore, the total number of
differential tables for a pair is 1 when the emulation type is OPEN-3.
1. If the selected volume is a CVS (custom volume size) volume, use the capacity of the custom volume instead of the default volume
capacity for the emulation type. Since the OPEN-L emulation type does not support custom volume operations, you must use the
default volume capacity of OPEN-L for X.
2. 1 KB equals 1024 bytes.
OPEN-8
OPEN-9
OPEN-E
OPEN-L
OPEN-V Total number of differential tables per pair =
(X): Volume capacity (KB) 2
(Z): Number of slots that can be managed by a differential table (61,312)
NOTE: Round the result of the calculation up to the nearest whole number.
For example, if the volume capacity (X) is the maximum OPEN-V volume capacity of
3,019,898,880 KB, the total number of differential tables is calculated as follows:
When you round up to the nearest whole number, the result is 193. Therefore, the total number
of differential tables for a pair is 193 when the emulation type is OPEN-V.
Table 5 Number of control cylinders according to emulation types
Emulation type Number of control cylinders
OPEN-3 8 (5,760 KB)
OPEN-8 27 (19,440 KB)
OPEN-9
OPEN-E 19 (13,680 KB)
OPEN-L 7 (5,040 KB)
OPEN-V 0 (0 KB)
X48÷()Y15×()+[]Z÷
2,403,360 48÷()815×()+[]61,312÷0.81860=
X 256÷()Z()÷
3,019,898,880 256÷()61,312÷192.40084=

18 Business Copy XP (BC) for the XP10000/XP12000
Table 6 shows the relationship between emulation type, capacity, and differential tables. Table 7 shows
the number of differential tables used in OPEN-V.
Table 6 Relationship between emulation type, capacity, and differential tables
Emulation type Capacity1
1. 1 GB = 10243Bytes
Differential tables per pair
OPEN-3 Does not depend on capacity 1
OPEN-9 Up to 2.7GB 1
Up to 5.5GB 2
Up to 6.8GB 3
OPEN-E Up to 2.7GB 1
Up to 5.5GB 2
Up to 8.4GB 3
Up to 11.2GB 4
Up to 13.5GB 5
OPEN-L 33.9GB 13
OPEN-V See Table 7
Table 7 Number of differential tables used in OPEN-V
Capacity1Differential
tables
Capacity1Differential
tables
Capacity1Differential
tables
Up to 14.9GB 1 Up to 493.9GB 33 Up to 972.9GB 65
Up to 29.9GB 2 Up to 508.9GB 34 Up to 987.9GB 66
Up to 44.9GB 3 Up to 523.9GB 35 Up to 1,002.8GB 67
Up to 59.8GB 4 Up to 538.8GB 36 Up to 1,017.8GB 68
Up to 74.8GB 5 Up to 553.8GB 37 Up to 1,032.8GB 69
Up to 89.8GB 6 Up to 568.8GB 38 Up to 1,047.8GB 70
Up to 104.7GB 7 Up to 583.7GB 39 Up to 1,062.7GB 71
Up to 119.7GB 8 Up to 598.7GB 40 Up to 1,077.7GB 72
Up to 134.7GB 9 Up to 613.7GB 41 Up to 1,092.7GB 73
Up to 149.6GB 10 Up to 628.7GB 42 Up to 1,107.6GB 74
Up to 164.6GB 11 Up to 643.6GB 43 Up to 1,122.6GB 75
Up to 179.6GB 12 Up to 658.6GB 44 Up to 1,137.6GB 76
Up to 194.5GB 13 Up to 673.5GB 45 Up to 1,152.5GB 77
Up to 209.5GB 14 Up to 688.6GB 46 Up to 1,167.6GB 78
Up to 224.5GB 15 Up to 703.5GB 47 Up to 1,182.5GB 79
Up to 239.4GB 16 Up to 718.4GB 48 Up to 1,197.4GB 80
Up to 254.4GB 17 Up to 733.4GB 49 Up to 1,212.4GB 81
Up to 269.4GB 18 Up to 748.4GB 50 Up to 1,227.4GB 82
Up to 284.3GB 19 Up to 763.4GB 51 Up to 1,242.5GB 83
Up to 299.3GB 20 Up to 778.3GB 52 Up to 1,257.3GB 84

Business Copy XP user guide for the XP10000/XP12000 19
Up to 314.3GB 21 Up to 793.3GB 53 Up to 1,272.3GB 85
Up to 329.3GB 22 Up to 803.3GB 54 Up to 1,287.3GB 86
Up to 344.2GB 23 Up to 823.2GB 55 Up to 1,302.2GB 87
Up to 359.2GB 24 Up to 838.2GB 56 Up to 1,317.2GB 88
Up to 374.2GB 25 Up to 853.2GB 57 Up to 1,332.2GB 89
Up to 389.1GB 26 Up to 868.1GB 58 Up to 1,347.1GB 90
Up to 404.1GB 27 Up to 883.1GB 59 Up to 1,362.1GB 91
Up to 419.1GB 28 Up to 898.1GB 60 Up to 1,377.1GB 92
Up to 434.0GB 29 Up to 913.0GB 61 Up to 1,392.0GB 93
Up to 449.0GB 30 Up to 928.0GB 62 Up to 1,407.0GB 94
Up to 464.0GB 31 Up to 943.0GB 63 Up to 1,422.0GB 95
Up to 478.9GB 32 Up to 957.9GB 64 Up to 1,436.9GB 96
Up to 1,451.9GB 97 Up to 1,945.9GB 130 Up to 2,439.9GB 163
Up to 1,466.9GB 98 Up to 1,960.9GB 131 Up to 2,454.8GB 164
Up to 1,481.8GB 99 Up to 1,975.8GB 132 Up to 2,469.8GB 165
Up to 1,496.8GB 100 Up to 1,990.8GB 133 Up to 2,484.8GB 166
Up to 1,511.8GB 101 Up to 2,005.8GB 134 Up to 2,499.7GB 167
Up to 1,526.8GB 102 Up to 2,020.7GB 135 Up to 2,514.7GB 168
Up to 1,541.7GB 103 Up to 2,035.7GB 136 Up to 2,529.7GB 169
Up to 1,556.7GB 104 Up to 2,050.7GB 137 Up to 2,544.6GB 170
Up to 1,571.7GB 105 Up to 2,065.6GB 138 Up to 2,559.6GB 171
Up to 1,586.6GB 106 Up to 2,080.7GB 139 Up to 2,574.6GB 172
Up to 1,601.6GB 107 Up to 2,095.6GB 140 Up to 2,589.5GB 173
Up to 1,616.6GB 108 Up to 2,110.5GB 141 Up to 2,604.5GB 174
Up to 1,631.5GB 109 Up to 2,125.5GB 142 Up to 2,619.5GB 175
Up to 1,646.5GB 110 Up to 2,140.5GB 143 Up to 2,634.4GB 176
Up to 1,661.5GB 111 Up to 2,155.4GB 144 Up to 2,649.4GB 177
Up to 1,676.4GB 112 Up to 2,170.4GB 145 Up to 2,664.4GB 178
Up to 1,691.4GB 113 Up to 2,185.4GB 146 Up to 2,679.3GB 179
Up to 1,706.4GB 114 Up to 2,200.4GB 147 Up to 2,694.3GB 180
Up to 1,721.4GB 115 Up to 2,215.3GB 148 Up to 2,709.3GB 181
Up to 1,736.3GB 116 Up to 2,230.3GB 149 Up to 2,724.3GB 182
Up to 1,751.3GB 117 Up to 2,245.3GB 150 Up to 2,739.2GB 183
Up to 1,766.3GB 118 Up to 2,260.2GB 151 Up to 2,754.2GB 184
Up to 1,781.2GB 119 Up to 2,275.2GB 152 Up to 2,769.2GB 185
Up to 1,796.2GB 120 Up to 2,290.2GB 153 Up to 2,784.1GB 186
Table 7 Number of differential tables used in OPEN-V (continued)
Capacity1Differential
tables
Capacity1Differential
tables
Capacity1Differential
tables

20 Business Copy XP (BC) for the XP10000/XP12000
If you intend to create pairs with volumes of different emulation types, the maximum number of pairs you
can create depends on the following conditions.
NOTE: For more information about calculating total number of differential tables per pair, see Table 4.
Calculating the number of BC pairs if LUSE is not used
Use the following equation to calculate whether the desired number of BC pairs can be created:
, where:
•is the required number of differential tables per pair (see Table 4).
•(number of BC pairs) is the number of BC pairs you want to create.
•is number of differential tables in the disk array.
• = 13,652 when additional shared memory for differential tables is not installed.
• = 30,718 when additional shared memory for differential tables is installed.
For example, if you create 10 pairs of OPEN-3 volumes and 20 pairs of OPEN-V volumes in a disk array
that does not have additional shared memory for differential tables, use the following equation:
.
Since 3,870 is less than 13,652, 10 pairs of OPEN-3 volumes and 20 pairs of OPEN-V volumes can be
created.
NOTE: When the emulation type is OPEN-3, and the capacity of the volume is 2,403,360 KB, the
number of differential tables required for a pair is 1. When the emulation type is OPEN-V, and the
capacity of the volume is 3,019,898,880 KB, the number of differential tables required for a pair is193.
Calculating the number of BC pairs if LUSE is used
Use the following equation to calculate whether the desired number of BC pairs can be created:
, where:
•is the required number of differential tables for each volume that forms the LUSE volume.
When you use LUSE volumes to create a BC pair, every volume that forms the LUSE volume uses the
differential tables as a pair. For example, if you create a BC pair by using LUSE volumes that are
created by combining two OPEN-V volumes, you need differential tables for two OPEN-V pairs.
•is number of differential tables in the disk array.
Up to 1,811.2GB 121 Up to 2,305.1GB 154 Up to 2,799.1GB 187
Up to 1,826.1GB 122 Up to 2,320.1GB 155 Up to 2,814.1GB 188
Up to 1,841.1GB 123 Up to 2,335.1GB 156 Up to 2,829.0GB 189
Up to 1,856.1GB 124 Up to 2,350.0GB 157 Up to 2,844.0GB 190
Up to 1,871.0GB 125 Up to 2,365.0GB 158 Up to 2,859.0GB 191
Up to 1,886.0GB 126 Up to 2,380.0GB 159 Up to 2,873.9GB 192
Up to 1,901.0GB 127 Up to 2,394.9GB 160 Up to 2,880.0GB 193
Up to 1,915.9GB 128 Up to 2,409.9GB 161
Up to 1,930.9GB 129 Up to 2,424.9GB 162
1. 1 GB = 10243Bytes
Table 7 Number of differential tables used in OPEN-V (continued)
Capacity1Differential
tables
Capacity1Differential
tables
Capacity1Differential
tables
Σα() number of BC Pairs()×{}β()≤
α()
β()
β()
β()
1 10 193 20
×+×3870 13,652≤=
ΣΣ α() number of volumes that form LUSE volumes()×{}number of BC pairs()×[]β()≤
α()
β()