HP D2D User manual

HP StorageWorks
D2D Backup System
User Guide
Part number: EH880-90950
Third edition: October 2007

Legal and notice information
© Copyright 2006 Hewlett-Packard Development Company, L.P.
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Contents
Aboutthisguide ......................... 11
Intendedaudience..................................... 11
Relateddocumentation................................... 11
Documentconventionsandsymbols ............................. 11
HPtechnicalsupport.................................... 12
Customerselfrepair .................................... 12
Productwarranties..................................... 12
Registeringyourtapedrive ................................. 12
Subscriptionservice .................................... 13
HPwebsites........................................ 13
Documentationfeedback .................................. 13
1Beforeyoustart......................... 15
Overview......................................... 15
Optionaltapeattach.................................... 15
Softwareandhardwarerequirements............................. 16
Terminology ....................................... 16
Autoloaders...................................... 16
Backupdevicesandslots................................ 16
Hosts ........................................ 16
Import/ExportandCopy ................................ 18
iSCSI ........................................ 18
Mailslots(import/exportelements)............................ 18
Physicaltapedrives .................................. 19
RAID......................................... 19
Storagecapacity ..................................... 19
Physicalstorage.................................... 19
Actualstorageused .................................. 19
Considerations when configuringcartridgesandslots.................... 19
Taperotationstrategies................................. 20
Compression ....................................... 21
2ConnectingandinstallingtheHPD2DBackupSystem ........ 23
Connectthehardware ................................... 23
DHCP and static IP addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
OptionalTapeAttach ................................. 24
Supported network configurations .............................. 24
AsadeviceonaGigabitEthernetnetwork ........................ 24
Directlyconnectedtoabackupserveronyourmainnetwork................. 25
Software installation, discovery and configuration ....................... 26
Recommendedwebbrowsersettings ............................. 26
InternetExplorer7.X .................................. 27
InternetExplorer6.X.................................. 27
MozillaFirefox1.5andFirefox2.X............................ 27
3Attachingaphysicaltapedrive(optional).............. 29
HardwarerequirementsforTapeAttach............................ 29
Tapedriveinstallationoverview ............................... 29
Removingtheaccesspanelandbezel ............................ 30
D2D Backup System 3

InstallingtheHBA ..................................... 31
Installinganinternaltapedrive ............................... 33
Replacingtheaccesspanelandbezel ............................ 35
Connectinganexternaltapedrive .............................. 36
4 The Installation wizard...................... 39
Before you install the firsthost................................ 39
RuntheInstallationwizard ................................. 40
5 Advanced installation ...................... 45
UsingDHCPtodiscovertheHPD2DBackupSystem ...................... 45
UsingtheDiscoveryEnginetodiscovertheHPD2DBackupSystem................ 45
Beaconmode..................................... 46
If the HP D2D Backup System is new and not yet configured ................. 46
If the HP D2D Backup System has been configuredincorrectly ................ 46
Ifthenetworksetuphasbeenchanged .......................... 46
MicrosoftiSCSIInitiator................................... 46
ManualiSCSIinitiatorinstallation ............................ 47
TheiSCSIInitiator ................................... 47
Generaltab.................................... 48
Discoverytab................................... 48
Targetstab.................................... 49
PersistentTargetstab................................ 50
BoundVolumes/Devicestab............................. 51
LinuxiSCSIinitiator .................................... 51
Manualdriverinstallation.................................. 51
HPLTOTapedriver .................................. 52
Mediumchangerdriver................................. 52
6LEDs.............................. 53
UnderstandingtheLEDs................................... 53
BootupLEDsequence ................................. 53
FirmwareLEDsequence................................. 53
Beaconmode....................................... 53
7BackupscenariosusingtheHPD2DBackupSystem ......... 55
Simplebackup ...................................... 55
Officebackup....................................... 56
Fileserver....................................... 56
Databaseserver.................................... 57
DesktopPC...................................... 58
Summary....................................... 59
High-performanceworkstationbackup ............................ 60
Mainbackuptoautoloader............................... 60
Additionalbackuptotapedrive ............................. 60
Summary....................................... 61
Incorporatingarchivetotapeintoarotationstrategy ...................... 61
8TheWebManagementInterface.................. 63
WhatistheWebManagementinterface?........................... 63
ToruntheWebManagementInterface............................ 63
Summary(Home) ..................................... 64
Statusicons...................................... 65
Devices (Configuration)................................... 65
Toviewdevicedetails ................................. 65
Toeditdevicedetails.................................. 66
Tocreateanewdevice................................. 66
4

Todeleteadevice................................... 67
Cartridges (Configuration) ................................. 67
Emptyslots...................................... 69
Toremoveacartridge ................................. 69
Towriteprotectacartridge ............................... 70
Toeditmaximumsize ................................. 70
Tocreateacartridge.................................. 70
Network (Configuration) .................................. 71
Network configuration ................................. 72
Toeditnetworksettings............................... 72
Resettingnetworksettingstofactorydefaults........................ 73
Beaconmode..................................... 73
Email Alerts (Configuration)................................. 74
To configureMicrosoftExchangeServer.......................... 75
Disk&RAID(Status) .................................... 76
RAIDstatus...................................... 76
Diskusage...................................... 76
Physicaldisks..................................... 77
iSCSI(Status) ....................................... 77
Log(Status)........................................ 78
TapeAttachpages..................................... 79
Shutdown(Admin)..................................... 79
Administration(Admin)................................... 80
Resettingthepassword................................. 80
Firmware(Admin) ..................................... 81
Support(Admin)...................................... 82
9 Export, import and copy using an attached tape drive . . . . . . . . 83
RequirementsforconnectingatapedrivetotheHPD2D..................... 83
Anoteaboutterminology.................................. 83
Archivingmethods..................................... 84
Cartridgecopy .................................... 84
WhyusetheCopyfunctionality?........................... 85
WhenwouldCopybeused? ............................ 85
Whenisitnecessarytorestorefromacopiedcartridge? ................ 85
DisadvantagesofCopy............................... 86
Cartridgeexport.................................... 86
WhyusetheExportfunctionality? .......................... 87
WhenwouldExportbeused?............................ 87
WhenwouldIrestorefromanexportedcartridge? ................... 87
DisadvantagesofExport .............................. 87
Cartridgeimport.................................... 88
Tapespanning .................................... 88
Using the Web Management interface to copy/export/import cartridges . . . . . . . . . . . . . 88
Configuration(TapeAttach)............................... 89
Addingtapedrivestothelist ............................ 89
Upgrading tape drive firmware ........................... 89
Copy/Export/Import(TapeAttach)............................ 89
Tocopytoattachedtapedrive............................ 90
Toexporttoattachedtapedrive........................... 91
Toimportfromattachedtapedrive.......................... 93
Status(TapeAttach) .................................. 94
Tocancelajob .................................. 95
Ifanerroroccurs ................................. 95
Schedule(TapeAttach)................................. 95
Tocreateaschedule................................ 96
Toview,editordeleteexistingschedules ....................... 97
JobHistory(TapeAttach)................................ 97
Compression ....................................... 98
D2D Backup System 5

10Copyusingatapedriveattachedtothehost............ 99
Requirements ....................................... 99
Tapedrivessupported ................................. 99
Archivefromhosttotapeprocess .............................. 99
Furtherinformation................................... 100
Compression ....................................... 100
11Restoreprocesses ....................... 101
Restorescenarios ..................................... 101
RestoringfromtheHPD2DBackupSystem........................... 102
ReconnectingtotheHPD2Dafterhostfailure ......................... 102
12 Troubleshooting . . . . .................... 105
Connectingthehardware.................................. 105
MynetworkdoesnothaveaspareGigabitport ...................... 105
Thesuppliedcableistooshort.............................. 105
Iamconnectingdirectlytoa10/100Base-Tportonastorageserver............. 105
DHCPisnotworking.................................... 105
RunningtheInstallationwizard................................ 106
Driversfailtoinstallusingtheinstallwizard ........................ 106
Device discovery fails to finddevice ........................... 106
iSCSIInitiatorfailstodownload ............................. 107
Thewizardhasnotcreatedanautoloaderformyhost.................... 107
Manualinstallation .................................... 108
HPD2DBackupSystemtroubleshooting............................ 108
PoweringuptheHPD2DBackupSystem ......................... 108
ShuttingdowntheHPD2DBackupSystem......................... 108
Disconnectinghosts .................................. 109
Devicetroubleshooting................................... 109
HostcannotconnecttothedevicefromWebManagementInterface.............. 109
Backupapplicationfailstoseedevice .......................... 109
Icannotcreateadevice ................................ 110
Icannotseeanewlycreateddevice ........................... 110
I cannot see additional slots from the backup application . . . . . . . . . . . . . . . . . . 110
Adeleteddevicekeepsreappearing ........................... 110
Ifbackupisslow.................................... 110
Cartridgetroubleshooting.................................. 110
Icannotresizecartridges................................ 110
Mytapedrivedevicehasrunoutofspace......................... 111
Thecartridgesformyattachedtapedrivearesmallerthan200GB.............. 111
Attachedtapedrivetroubleshooting ............................. 111
An attached tape drive does not appear on the Web interface . . . . . . . . . . . . . . . . 111
Cartridgecopyorexportfails.............................. 111
Cartridgeimportfails.................................. 111
Emailalertstroubleshooting................................. 112
Disktroubleshooting .................................... 112
IftheHPD2DBackupSystemrunsoutofspace ...................... 112
Ifadiskfails ..................................... 112
13Harddiskreplacement ..................... 113
Replaceableparts..................................... 113
RAID5........................................ 113
HowdoIknowadiskhasfailed? .............................. 113
Ifmorethanonediskfails................................ 114
Electrostaticdischargeinformation .............................. 115
Replacingtheharddisk................................... 115
Replacingacompleteunit.................................. 122
6

Index .............................. 123
D2D Backup System 7

Figures
1FrontandrearviewoftheHPD2DBackupSystem.................. 15
2Device configurationwithonehost ........................ 17
3Device configurationwithmultiplehosts ...................... 18
4Storage capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5Networkandpowerconnectors.......................... 23
6AttachingatapedrivetotheHPD2DBackupSystem ................ 24
7Connectingtoabusinessserveronthemainnetwork ................ 25
8Connecting toadedicatedbackupnetwork..................... 25
9Connectingtoanetworkserver.......................... 26
10 AttachingatapedrivetotheHPD2DBackupSystem ................ 29
11 Removingtheaccesspanel............................ 30
12 Removing thefrontbezel............................. 31
13 Removingtheslotcoverretainer.......................... 31
14 Removingthetopexpansionslotcover....................... 32
15 InstallingtheHBA................................ 32
16 ReplacingthePCIslotcover ........................... 33
17 Removing the fillerpanel............................. 33
18 Selectingthecorrectscrews ........................... 34
19 Attachingthescrewsandmetalshims ....................... 34
20 Installingtheinternaltapedrive(exampleshowsaSCSItapedrive) .......... 35
21 Removingtheblankplateinthebezel....................... 35
22 Replacingthebezel............................... 36
23 Replacingtheaccesspanel ........................... 36
24 Connectingthecables(SCSItapedrive) ...................... 37
25 PoweringontheHPD2DBackupSystem...................... 40
26 Creatingthebackupdevice ........................... 43
27 iSCSIInitiatordownloadpage .......................... 47
28 LEDs ..................................... 53
29 Simplebackupfromasinglehost......................... 56
30HP D2D Backup System after the firsthostisconfigured................ 57
31 HP D2D Backup System after the second host is configured.............. 58
32HP D2D Backup System after the third host is configured ............... 59
33 Option remains to configuremorehosts ...................... 60
8

34 HPD2DBackupSystemwithonehostandtwodevices................ 61
35 Copyingtophysicaltapeaspartofarotationstrategy................ 62
36 Cartridge copy ................................. 85
37 Cartridgeexport ................................ 87
38 Cartridgeimport ................................ 88
39 Archivingtotape................................ 100
40 FewerhostsaresupportedbecauseHosts1,2and3havetwodevices......... 108
41 Removingtheaccesspanel............................ 117
42 Removing thefrontbezel............................. 117
43 Removingthediskcover............................. 118
44 Identifyingtheharddisk............................. 118
45 Removingtheharddrive............................. 119
46 Installingaharddrive.............................. 119
47 Replacingthedrivecover ............................ 120
48 Replacingthebezel............................... 120
49 Replacingtheaccesspanel ........................... 121
D2D Backup System 9

Tables
1 Documentconventions.............................. 11
2Summarypagelayout.............................. 65
3 Deviceparameters ............................... 67
4Cartridge parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5Network parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
6Emailparameters................................ 75
7Physicaldiskparameters............................. 77
8Jobscheduleparameters............................. 97
9 Restorescenarios................................ 101
10

About this guide
This guide provides information about:
•Installing the HP StorageWorks D2D Backup System
•Using the HP StorageWorks D2D Backup System
•Troubleshooting the HP StorageWorks D2D Backup System
Intended audience
This guide is intended for users who install, operate and maintain the HP StorageWorks D2D Backup
System.
Related documentation
In addition to this guide, the following document provides related information:
•‘Starthere’posterforanoverviewoftheinstallationinformationinthisguide(availablein
English, French, German and Japanese)
You can find these documents from the Manuals page of the HP Business Support Center website:
http://www.hp.com/support/manuals
In the Storage section, click Storage Solutions and then select your product.
http://www.hp.com/support/manuals
Document conventions and symbols
Table 1 Document conventions
Convention Element
Blue text: Table 1 Cross-reference links and e-mail addresses
Blue, underlined text: http://www.hp.com website 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, tabs, 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
D2D Backup System 11

WARNING!
Indicates that failure to follow directions could result in bodily harm or death.
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.
HP technical support
For worldwide technical support information, see the HP support website:
http://www.hp.com/support
Before contacting HP, collect the following information:
•Product model names and numbers
•Technical support registration number (if applicable)
•Product serial numbers
•Error messages
•Operating system type and revision level
•Detailed questions
Customer self repair
HP customer self repair (CSR) programs allow you to repair your StorageWorks product. If a CSR
part needs replacing, HP ships the part directly to you so that you can install it at your convenience.
Some parts do not qualify for CSR. Your HP-authorized service provider will determine whether a repair
can be accomplished by CSR.
For more information about CSR, contact your local service provider. For North America, see the CSR
website:
http://www.hp.com/go/selfrepair
Product warranties
For information about HP StorageWorks product warranties, see the warranty information website:
http://www.hp.com/go/storagewarranty
Registering your tape drive
Once you have installed and tested your HP D2D Backup System please take a few minutes to register
your product. You can register via the web (www.register.hp.com).
12 About this guide

To ensure your registration is complete, there are a number of questions on the electronic form that are
mandatory. Other questions are optional. However, the more you feel able to complete, the better HP
can meet your needs.
Subscription service
HP recommends that you register your product at the Subscriber’s Choice for Business website:
http://www.hp.com/go/e-updates
After registering, you will receive e-mail notification of product enhancements, new driver versions,
firmware updates, and other product resources.
HP websites
For additional information, see the following HP websites:
•h
ttp://www.hp.com
•http://www.hp.com/go/storage
•http://www.hp.com/service_locator
•http://www.hp.com/support/manuals
•http://www.hp.com/support/downloads
Documentation feedback
HP welcomes your feedback.
To make comments and suggestions about product documentation, please send a message to
[e-mail]. All submissions become the property of HP.
D2D Backup System 13

14 About this guide

1 Before you start
In this chapter:
•“Overview” on page 15
•“Optional tape attach one” on page 15
•“Software and hardware requirements” on page 16
•“Terminology” on page 16
•“Storage capacity” on page 19
•“Compression” on page 21
Overview
The HP StorageWorks D2D Backup System is an iSCSI disk-based storage appliance that emulates up to
six tape devices; these tape devices can be used to back up a maximum of six host network servers or
PCs. Each tape device is configured as an 1x8 G2 Ultrium Tape Autoloader (or standalone Ultrium Tape
Drive). Autoloaders may be configured with between 8 and 24 slots.
1. LEDs 4. Network connector
2. Power On button 5. Power connector
3. Location for optional attached tape drive (see “Attaching a physical tape drive”onpage29)
Figure 1 Front and rear view of the HP D2D Backup System
Optional tape attach
An Ultrium Tape Drive may be attached directly to the HP D2D Backup System, allowing the user to store
backups offsite. An internal tape drive must be half-height and is installed in the half-height bay above
the LEDs, labeled 3on Figure 1. External tape drives may be half-height or full-height. Both SAS and
SCSI tape drives are supported and require installation of a host bus adapter (HBA).
D2D Backup System 15

To find out which Ultrium Tape Drive models and HBAs and are supported, refer to
www.hp.com/go/connect .
Software and hardware requirements
Refer to www.hp.com/go/connect for the latest connectivity and compatibility information.
•The HP D2D Backup System should be connected to a Gigabit Ethernet network. 100 Base-T
Ethernet will limit performance; 10 Base-T Ethernet will severely limit performance. For example
network topologies, see “Supported network configurations” on page 24.
•For backup and restore you need software that supports tape autoloaders. This software resides
on the host, not the HP D2D Backup System. A CD-ROM containing HP Data Protector Express
software is supplied with the HP D2D Backup System. The device may also be used with the major
backup applications from HP, Symantec, EMC, Computer Associates and others.
•Windows Backup is only supported with standalone tape drives created on the HP D2D Backup
System. It is not supported for use with autoloader backup devices created on the HP D2D
Backup System.
Terminology
Autoloaders
An autoloader is a backup device that has multiple storage slots. Each storage slot contains a cartridge.
This has two advantages over standalone tape drives:
•The overall storage capacity is much greater.
•More importantly, each cartridge can be allocated to a specific backup task; for example,
one cartridge can hold Monday’s data, another can hold Tuesday’s data, and so on. In this
way, backup applications are able to implement tape rotation strategies that accommodate
differing backup requirements for daily, weekly, monthly, yearly backups. Please see
“Backup scenarios using the HP D2D Backup System” on page 55 for worked examples.
Backup devices and slots
Backup devices appear to the host as locally-attached tape devices, but physically, they use disk space on
the HP D2D Backup System which, as in tape terminology, is referred to as slots or cartridges.
Depending on your data protection strategy, you may configure each backup device as a standalone HP
StorageWorks Ultrium Tape Drive or, more typically, as an HP StorageWorks 1x8 G2 Tape Autoloader
with attached Ultrium Tape Drive.
•When you configure your HP D2D Backup System with a standalone tape drive, 200 GB of
physical disk space is made available for that tape drive. This is the equivalent of a permanently-
mounted 200 GB tape cartridge, which cannot be unloaded. Tape spanning is impossible, so the
data to be backed up must not exceed 200 GB.
•When you configure your HP D2D Backup System with a tape autoloader, up to 200 GB of
physical disk space can be made available for each configured slot. This is the equivalent of an
autoloader with multiple slots, each containing a 200 GB cartridge. Both tape spanning and,
more importantly, flexible tape rotation strategies are possible.
Hosts
Each emulated tape device is uniquely mapped to an individual host; this is the network server or
PC that you wish to back up.
•The tape device appears to the host as a locally-attached tape autoloader or tape drive.
•The tape device is accessed and managed from the backup software running on the host.
•Thetapedeviceisnotvisibletootherdevicesonthenetwork.
16 Before you start

•Multiple servers may not back up to a single tape device.
Figure 2 on page 17 shows a configuration with a single host. Figure 3 on page 18 shows a
configuration with six hosts. See “Connecting and installing the HP D2D Backup System”onpage23for
more example configurations.
LAN
Host3Host2 Host4/5/6Host1
1
2
3
4
5
6
7
8
HP StorageWorks D2D Backup System
Autoloader 1
1. The Installation wizard has been run on Host 1.
2. The HP D2D Backup System automatically generates an autoloader for the host. The user may specify
the number of slots during installation.
Figure 2 Device configuration with one host
•By default, the host sees only one device, the autoloader that has been configured for it during
installation. Data from each host goes to its corresponding autoloader.
•Each backup device is visible only to the host for which it has been configured.
•A host may have multiple devices configured for it on the HP D2D Backup System, but this means
fewer hosts may be connected (not illustrated, see Figure 34 on page 61 for an example of
one host with two devices).
D2D Backup System 17

HP StorageWorks D2D Backup System
LAN
Host4Host3Host2Host1
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Host6
Autoloader 2 Autoloader 3 Autoloader 4 Autoloader 5 Autoloader 6
Host5
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Autoloader 1
1
2
3
4
5
6
7
8
1. The HP D2D Backup System can be used to back up a maximum of six hosts
2. The Installation wizard automatically generates an autoloader for each host. The user may specify
the number of slots during installation.
Figure 3 Device configuration with multiple hosts
Import/Export and Copy
If you attach a supported, physical tape drive directly to your HP D2D Backup System, you will be
able to copy or export data to the physical tape drive so that backups can be stored offsite. This is an
important requirement for Disaster Recovery strategies. The main difference between copy and export
is that copied data remains on the HP D2D Backup System; exported data is removed from it, but can
be imported easily when required. These functions are grouped under the Tape Attach section of the
Web Interface. Please see “Export, import and copy to an attached tape drive” on page 83 for more
details about working with Tape Attach.
iSCSI
The HP D2D Backup System is an iSCSI device. This means that the HP D2D Backup System plugs directly
into the network, but it presents devices as directly-attached SCSI autoloaders to host machines. In order
to function, it requires an iSCSI initiator. On Windows systems, this is normally downloaded by the
Installation wizard, as described in “Connecting and installing the HP D2D Backup System” on page 23.
For more information about iSCSI, see “Advanced installation” on page 45. Linux users should also refer
to the “Linux Configuration Guide” on the HP StorageWorks Tape CD-ROM for more information.
Mail slots (import/export elements)
A mail slot is a term borrowed from tape terminology to identify a dedicated slot that is used specifically to
import and export cartridges. They are sometimes called import/export elements by backup applications.
Backup applications that support this feature move cartridges from the mail slot when the user runs an
Export job, and look for cartridges in the mail slot when the user runs an Import job.
18 Before you start

Physical tape drives
Aphysicaltapedrive is a tape drive that is attached to the HP D2D Backup System or the host computer,
so that data can be moved from the HP D2D Backup System and stored offsite. (It should not be
confused with the tape drive device that can be configured as one of the backup devices on the HP
D2D Backup System.)
RAID
RAID stands for Redundant Array of Inexpensive (or Independent) Devices, which is a data storage
scheme that divides data among multiple hard drives, increasing data reliability and throughput. The
HP D2D Backup System is a RAID5 device, which offers the best combination of data protection and
capacity. It has four hard disks, but if one of the disks fails, no data is lost and the HP D2D Backup
System continues to operate correctly. (The failed disk should be replaced as soon as possible, as
described in “Replacing the hard disk” on page 115.)
Storage capacity
Physical storage
The physical storage capacity of the HP D2D Backup System 130 is 3.0 TB (3000 GB), of the HP
D2D Backup System 120 is 2.0 TB (2000 GB) and of the HP D2D Backup System 110 is 1 TB (1000
GB). However, in order to ensure a high level of data integrity, the disks use RAID 5 protection. This
reduces the available capacity but ensures that, in the event of a single disk failure in the device, there
will be no data loss.
Actual storage capacity is approximately:
•2.25 TB for the HP D2D Backup System 130
•1.5 TB for the HP D2D Backup System 120
•750 GB for the HP D2D Backup System 110
You cannot add physical disk space, but you may be able to create some space. Options for creating
space, if the disks start to get full, are:
•Review your backup jobs to see if you can reduce the size of backup or retention time.
•Use the backup application job settings to overwrite or erase data.
•Export cartridges to physical tape.
Actual storage used
The default maximum cartridge size is 200 GB, but the HP D2D Backup System only allocates space as it
is required for backup. Individual backup jobs rarely use a whole cartridge and you are unlikely to use all
the available disk capacity. However, when configuring the HP D2D Backup System for extremely flexible
tape rotation schemes, it may be necessary to exercise a little care. You should take the following factors
into consideration to ensure that you do not over-commit physical storage space:
•The number of slots that you have configuredinanautoloader.Thedefaultconfiguration is 8, but
you can edit that to be any number up to 24 (24 x 200 GB = 4.8 TB, which is greater than the
physical disk capacity. Therefore, you could not fill all of these slots with the capacity available.)
•The number of devices that you have created. It is possible to create up to six tape autoloaders,
each with 24 slots. You could not fill all of these slots with the physical disk capacity available.
Considerations when configuring cartridges and slots
Each slot configured commits 2 GB of physical disk space, regardless of what value has been configured
for the maximum cartridge size. The remainder of the configured maximum capacity is used only as
needed, but the initial 2 GB is permanently committed. Therefore, only configure the number of slots
D2D Backup System 19

that you actually require. If you configure six 24-slot autoloaders, you should be aware that you have
committed 192 GB of disk space. Only do this, if you are sure all slots will be used. Once added,
slotscannotberemoved.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1. 8x2GBofphysicaldiskspacehasbeencommitted.
2. The remainder of the configured maximum capacity is used only as needed, but the initial 2 GB is
permanently committed.
Figure 4 Storage capacity
The example configurations in “Backup scenarios using the HP D2D Backup System” on page 55 illustrate
how you can make full use of the available slots in designing your backup rotation strategy and ensure
that youdonotcreateabackupschemethatwouldresultinrunningoutofphysicaldiskspace.
NOTE:
The LED indicators and the Status pages on the Web Management Interface will warn you when disks
in the HP D2D Backup System exceed 90% full.
Tape rotation strategies
Tape rotation strategies determine when backups are run, the number of cartridges that are required and
how they are reused. The HP D2D Backup System is a very flexible device that can easily be incorporated
into most tape rotation strategies. If your organization does not yet have a tape rotation strategy in place,
see “Backup scenarios using the HP D2D Backup System” on page 55 for example configurations.
20 Before you start