HP D2D100 User manual

HP StorageWorks
D2D Backup System
nl
HP D2D2503
User Guide
Part number: EH990-90905
Third edition: December 2008

Legal and notice information
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Contents
Aboutthisguide ......................... 13
Intendedaudience..................................... 13
Relateddocumentation................................... 13
Documentconventionsandsymbols ............................. 13
HPtechnicalsupport.................................... 14
Customerselfrepair .................................... 14
Productwarranties..................................... 14
RegisteringyourHPD2DBackupSystem ........................... 14
Subscriptionservice .................................... 15
HPwebsites........................................ 15
Documentationfeedback .................................. 15
1Beforeyoustart......................... 17
Overview......................................... 17
Optionaltapeattach.................................... 18
Softwareandhardwarerequirements............................. 18
Terminology ....................................... 19
Autoloaders...................................... 19
Backupdevicesandslots................................ 19
Deduplication..................................... 19
Emulationtypes.................................... 19
HostsonanEthernetnetwork .............................. 19
iSCSI ........................................ 21
Libraries ....................................... 21
Mailslots(import/exportelements)............................ 21
Physicaltapedrives .................................. 21
RAID......................................... 22
Replication...................................... 22
TapeAttach...................................... 22
Storagecapacity ..................................... 22
Physicalstorage.................................... 22
Taperotationstrategies................................. 22
Datadeduplication .................................... 23
Technologytypes ................................... 23
DatadeduplicationandtheHPD2D ........................... 23
BenefitsofHPD2Ddeduplication ............................ 23
Deduplicationandcompression ............................. 24
Taperotationexamplewithdatadeduplication....................... 24
Retentionpolicy.................................. 24
Dataparameters.................................. 24
Typicalsavings .................................. 24
2ConnectingandinstallingtheHPD2DBackupSystem ........ 27
Installingtherailkit .................................... 27
Overview....................................... 27
Kitcontents...................................... 27
Importantsafetyinformation............................... 27
Installationguidelines ................................. 27
Mountingtheserver .................................. 28
Connectingthehardware.................................. 32
D2D Backup System HP D2D2503 3

Supported Ethernet configurations .............................. 32
Ethernetnetworkconnection............................... 32
IPv4andIPv6networkprotocols........................... 32
Dualnetworkports................................. 32
DHCPandstaticIPaddressing............................ 33
HPD2DonaGigabitEthernetnetwork........................ 33
PoweringontheHPD2D.................................. 34
Software installation, discovery and configuration ....................... 34
InstallationwizardforWindowsusers........................... 35
RunningtheInstallationwizard............................ 35
Recommendedwebbrowsersettings ............................. 37
InternetExplorer7.X .................................. 37
InternetExplorer6.X.................................. 38
MozillaFirefox1.5,Firefox2.XandFirefox3.X ...................... 38
3Attachingaphysicaltapelibraryortapedrive(optional) ....... 39
HardwarerequirementsforTapeAttach............................ 39
Supporteddevices................................... 39
Tapedeviceinstallationoverview............................... 39
Removingthetopcover................................... 40
InstallingtheHBA ..................................... 40
RemovingthePCICage................................. 41
Removingtheslotcover................................. 41
InstallingthePCIeCard................................. 42
ReinstallingthePCICage................................ 42
Replacingthetopcover................................... 43
Connectinganexternalorrackmountstoragedevice ...................... 44
4 Advanced installation ...................... 45
Manualdriverinstallation.................................. 45
HPLTOTapedriver .................................. 45
Mediumchangerdriver................................. 45
UsingDHCPtodiscovertheHPD2DBackupSystem(IPv4only).................. 46
UsingtheDiscoveryEnginetodiscovertheHPD2DBackupSystem(IPv4only) ........... 46
Beaconmode..................................... 47
If the HP D2D Backup System is new and not yet configured ................. 47
If the HP D2D Backup System has been configuredincorrectly ................ 47
Ifthenetworksetuphasbeenchanged .......................... 47
UsingtheconsoletodiscovertheHPD2DBackupSystem(IPv4andIPv6) ............. 47
Toconnectthesystemconsole.............................. 47
iSCSIInitiator....................................... 49
ManualiSCSIinitiatorinstallation ............................ 49
TheiSCSIInitiatorandAuthentication........................... 50
TheMicrosoftiSCSIInitiator............................... 50
Generaltab.................................... 50
Discoverytab................................... 52
Targetstab.................................... 52
PersistentTargetstab................................ 54
BoundVolumes/Devicestab............................. 55
LinuxandUNIXiSCSIinitiators ............................... 55
5LEDs.............................. 57
FrontpanelLEDs...................................... 57
RearpanelLEDs...................................... 57
Beaconmode....................................... 58
6Configuringandusingreplication ................. 59
4

Replicationoverview.................................... 59
Howisreplicationinitiated?............................... 59
ReplicationandTapeAttach............................... 59
Preparingforreplication .................................. 60
Replicationconceptsandterminology............................. 60
Replicationelements.................................. 60
FanIn,FanOutandjobconcurrency........................... 61
FanOUT..................................... 61
FanIN...................................... 62
Jobconcurrency.................................. 64
Replicationdeploymentstrategies .............................. 65
ActivetoPassiveexample................................ 65
ActivetoActiveexample ................................ 66
ManytoOneexample................................. 66
ReplicationLicensing.................................... 67
Beforeyoustart .................................... 67
CreatingtheLTU.................................... 68
ApplyingtheLTU ................................... 68
TheReplicationprocess................................... 68
SeedingtheReplicationTargetAppliance......................... 68
Runningthereplicationwizard.............................. 70
RecoveringaSourceAppliance ............................... 74
Reversereplicationusingthewizard ........................... 74
Reverse replication, source lost and mapping deleted . . . . . . . . . . . . . . . . . . . . 77
PromotingaTargetLibraryovertheWANusingSCSI.................... 79
PromotingaTargetLibraryusingcolocation........................ 81
Recoveryfromphysicalmediadirecttohost ........................ 83
7TheWebManagementInterface.................. 87
WhatistheWebManagementinterface?........................... 87
ToruntheWebManagementInterface............................ 87
Summary(Home) ..................................... 88
Statusicons...................................... 90
Devices (Configuration)................................... 90
Emulationtypesfortapedevices............................. 91
Libraries, slots and storage capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Userrecommendations............................... 92
Toviewdevicedetails ................................. 92
Toeditdevicedetails.................................. 92
Tocreateanewdevice................................. 92
Todeleteadevice................................... 94
Cartridges (Configuration) ................................. 94
Emptyslots...................................... 96
Todeleteacartridge.................................. 96
Towriteprotectacartridge ............................... 96
Toeditmaximumsize ................................. 96
Tocreateacartridge.................................. 97
Tomoveorunloadcartridges .............................. 97
Network (Configuration) .................................. 97
Network configuration ................................. 98
Toeditnetworksettings............................... 98
Resettingnetworksettingstofactorydefaults........................ 99
Beaconmode..................................... 100
Email Alerts (Configuration)................................. 100
To configureMicrosoftExchangeServer.......................... 101
Disk(Status)........................................ 102
Diskusage...................................... 102
RAID(Status) ....................................... 103
RAIDstatus...................................... 103
Physicaldisks..................................... 103
D2D Backup System HP D2D2503 5

iSCSI(Status) ....................................... 104
Log(Status)........................................ 105
Sortingandsearchingthelog.............................. 106
TapeAttachpages..................................... 106
Replicationpages ..................................... 106
Status(Replication)..................................... 107
Mapping Configuration(Replication)............................. 107
Locallibrary ..................................... 108
Thereplicationwizards................................. 109
Appliance(Replication)................................... 110
Toaddatargetappliance ............................... 111
ToeditorremoveaTargetAppliance........................... 111
TargetandSourceApplianceparameters......................... 111
LocalSettings(Replication) ................................. 112
Configureblackoutwindows............................... 112
Configurereplicationports ............................... 113
Enablebandwidthlimiting ............................... 113
EventHistory(Replication).................................. 113
Sortingandsearchingtheeventhistory.......................... 114
Admin(Settings)...................................... 114
Resettingthepassword................................. 115
Date&Time(Settings) ................................... 115
Shutdown(Settings) .................................... 116
Firmware(Settings)..................................... 117
Support(Settings) ..................................... 118
License(Settings) ..................................... 119
Moreaboutreplicationlicensing............................. 119
Moreaboutcapacityupgradelicensing.......................... 119
Toapplythelicensekey ................................ 119
8 Using Tape Attach . . . . .................... 121
Optionsforarchivingtotape ................................ 121
Anoteaboutterminology................................ 121
Archivingmethods..................................... 122
Cartridgecopy .................................... 122
WhyusetheCopyfunctionality?........................... 122
WhenwouldCopybeused? ............................ 123
Whenisitnecessarytorestorefromacopiedcartridge? ................ 123
DisadvantagesofCopy............................... 123
Cartridgeexport.................................... 123
WhyusetheExportfunctionality? .......................... 124
WhenwouldExportbeused?............................ 124
WhenwouldIrestorefromanexportedcartridge? ................... 125
DisadvantagesofExport .............................. 125
Compression ..................................... 125
Cartridgeimport.................................... 125
Tapespanning .................................... 126
TapeAttachandreplication................................. 126
UsingtheTapeAttachwebpages .............................. 126
Configuration(TapeAttach)............................... 127
Addingtapestoragedevicestothelist ........................ 127
Viewingandeditingtapedevicedetails........................ 127
Viewingcartridgedetails.............................. 128
Obtainingsupport................................. 128
Upgrading tape storage device firmware ....................... 129
Manualjobs(TapeAttach) ............................... 130
ToselectcartridgesontheHPD2Dlibrary....................... 131
Tocopytoattachedtapestoragedevice ....................... 131
Toexporttoattachedtapestoragedevice....................... 133
Toimportfromattachedtapestoragedevice...................... 134
6

Scheduledjobs(TapeAttach) .............................. 134
Tocreateascheduledjob.............................. 135
Sortingandsearchingscheduledjobs ........................ 139
Toview,editordeleteexistingschedules ....................... 139
Status(TapeAttach) .................................. 140
Tocancelajob .................................. 140
Ifanerroroccurs ................................. 141
JobHistory(TapeAttach)................................ 141
Sortingandsearchingthejobhistory......................... 142
9Copyusingatapedriveattachedtothehost ............ 143
Requirements ....................................... 143
Tapedrivessupported ................................. 143
Archivefromhosttotapeprocess .............................. 143
Furtherinformation................................... 144
Compression ....................................... 144
10Restoreprocesseswithoutreplication ............... 145
Restorescenarios ..................................... 145
RestoringfromtheHPD2DBackupSystem........................... 146
Restoreanddeduplication.................................. 146
ReconnectingtotheHPD2Dafterhostfailure ......................... 146
11Troubleshooting ........................ 151
Connectingthehardware.................................. 151
Connecting to the HP D2D from the backup application . . . . . . . . . . . . . . . . . . . . . 151
Connectingtothenetwork ................................. 151
Performance ....................................... 152
Network ....................................... 152
WebManagementInterfaceerrorsandwarnings........................ 152
DiskRAIDerrorsandwarnings ............................. 152
Networkwarnings................................... 153
Systemstate...................................... 153
PowerOn/OffProblems .................................. 153
HPD2Dshutsdownautomatically ............................ 153
HPD2Ddoesnotbootupcorrectly............................ 153
HPD2Dbootsupcorrectly,butcannotbeseenonthenetwork................ 154
CannotconnecttoWebManagementInterface ........................ 154
HPD2Disnotvisibleonthenetwork........................... 154
CannotlogintotheWebManagementInterface...................... 154
CannotauthenticateaniSCSIsession............................. 154
IftheHPD2DBackupSystemrunsoutofdiskspace ...................... 154
HP D2D configurationproblems ............................... 154
Icannotseeanewlycreateddevice ........................... 154
I cannot see additional slots from the backup application . . . . . . . . . . . . . . . . . . 155
Replacementofhardware.................................. 155
Eventlogdisplays‘InvalidBIOSAssemblyname’...................... 155
RAIDbatterybackupstatus ............................... 155
IftheRAIDbatteryfails................................. 155
12Harddiskreplacement ..................... 157
RAID5.......................................... 157
HowdoIknowadiskhasfailed? .............................. 157
Ifyouhaveasystemconsole .............................. 159
Ifyouhaveemailalerts................................. 160
TheEventLog..................................... 160
Electrostaticdischargeinformation .............................. 161
D2D Backup System HP D2D2503 7

Replacingtheharddisk................................... 161
EmailalertsandLog.................................. 168
Ifyouhaveasystemconsole .............................. 168
Ifseveraldisksfail..................................... 169
Replacingthedisks .................................. 170
InitializingRAID.................................... 171
Createcartridges ................................. 171
Index .............................. 173
8

Figures
1FrontviewoftheHPD2DBackupSystem...................... 17
2Rear view of the HPD2DBackupSystem...................... 18
3Device configurationwithonehost ........................ 20
4Device configurationwithmultiplehosts ...................... 21
5Datastoredafterdeduplication.......................... 23
6Space saving withdeduplication ......................... 25
7Attachtherailstotherackcolumns ........................ 29
8Insert the HPD2Dintotherack.......................... 30
9CTObracketlocation .............................. 31
10 Secure the HPD2Dtotherack .......................... 31
11 Networkandpowerconnectors.......................... 32
12 Connectingtoabusinessserveronthemainnetwork ................ 33
13 Connectingtoadedicatedbackupnetwork..................... 34
14 PoweringontheHPD2DBackupSystem...................... 34
15 Removingthetopcover ............................. 40
16 RemovingthePCIcage ............................. 41
17 Removingtheslotcover(lowprofile)........................ 42
18 Installing the PCIe card (in the low profileslot) ................... 42
19 ReinstallingthePCIcage............................. 43
20 SecuringthePCIcage.............................. 43
21 Replacingthetopcover ............................. 44
22 SystemconsoleconnectionsontheHPD2D..................... 48
23 Systemconsolescreen.............................. 48
24 iSCSIInitiatordownloadpage .......................... 49
25 Generaltab(iSCSI)............................... 51
26 CHAPsecret.................................. 51
27 Discoverytab(iSCSI) .............................. 52
28 Addtargetportal................................ 52
29 Targetstab(iSCSI) ............................... 53
30 AdvancedsettingsCHAP ............................ 54
31 PersistentTargetstab(iSCSI) ........................... 55
32 FrontviewoftheHPD2DBackupSystem...................... 57
33 RearpanelLEDs ................................ 58
D2D Backup System HP D2D2503 9

34 ReplicationandTapeattach ........................... 60
35 Replicationelements .............................. 61
36 FanOUTexampleforHPD2D400xandD2D41xx ................. 62
37 HPD2D2500FanOUTexample......................... 62
38 HPD2D250xSeriesFanINexample ....................... 63
39 HPD2D400xand41xxSeriesFanINexample................... 64
40 Active to Passivereplicationexample ....................... 66
41 Activetoactivereplicationexample........................ 66
42 Manytoonereplicationexample......................... 67
43 SeedinginitialdatausingTapeAttach....................... 69
44 Replicationcreationprocess ........................... 70
45 Recoverybyrepopulatingareplacementsourceappliance .............. 75
46 Reversereplicationprocess:sourcelost,mappingintact ............... 76
47 Reversereplicationprocess:sourcelost,mappingdeleted............... 78
48 Recoveryprocess:promotingatargetlibraryovertheWAN ............. 80
49 RecoverybyrelocatingtheTargetAppliance .................... 81
50 Recoveryprocess:promotingatargetlibraryusingcolocation............. 82
51 Recoveryprocess:usingphysicaltape....................... 84
52 Createnewtargetappliance........................... 111
53 Cartridgecopy................................. 122
54 Cartridgeexport ................................ 124
55 Cartridgeimport ................................ 126
56 Archivingtotape................................ 144
57 SummarypagewithRAIDstatuswarning...................... 158
58 Identifyingthefaileddisk ............................ 159
59 Systemconsoleshowingfaileddisks........................ 160
60 Logshowingdiskfailure............................. 161
61 Removingthetopcover ............................. 162
62 Removingthemiddlecover............................ 163
63 Disknumbering ................................ 163
64 Removingtheharddriveassembly......................... 164
65 Removingdiskfromcarrier............................ 164
66 Installingdiskincarrier ............................. 165
67 Fasteningdisktocarrier............................. 165
68 Installingthedisk................................ 166
69 Reinstallingthetopmiddlecover ......................... 166
70 Reinstallingthetopcover ............................ 167
10

71 RAIDrebuilding ................................ 168
72 SystemconsoleduringRAIDrebuild........................ 169
73 Statusshowingmultiplediskfailure ........................ 170
74 RAIDshowingtwodiskfailures.......................... 170
75 Devices page awaitingRAIDinitialization ..................... 170
76 Systemconsoleaftertwodisksarereplaced .................... 171
D2D Backup System HP D2D2503 11

Tables
1Documentconventions.............................. 13
2Datadeduplicationsavings,example1 ...................... 25
3FanIn,FanOutandjobconcurrencyrules ..................... 65
4Summarypagelayout.............................. 89
5Deviceparameters(tophalfofthepage)...................... 91
6 Device parameters ............................... 92
7Cartridge parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8Network parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
9Networkportparameters ............................ 99
10 Emailparameters................................ 101
11 Physicaldiskparameters............................. 104
12 Local library parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
13 Replicationsourceforlocallibraryparameters ................... 109
14 Slotmappingforlocallibrarytosourcelibraryparameters .............. 109
15 Targetapplianceparameters........................... 111
16 Source applianceparameters........................... 112
17 Jobscheduleparameters............................. 138
18 Scheduledjobdetails.............................. 139
19 Restorescenarios................................ 145
12

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 HP D2D2503 13

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 HP D2D Backup System
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 (http://www.register.hp.com).
14 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/ebs
•http://www.hp.com/go/connect
•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 HP D2D2503 15

16 About this guide

1 Before you start
In this chapter:
•“Overview” on page 17
•“Optional tape attach”onpage18
•“Software and hardware requirements” on page 18
•“Terminology” on page 19
•“Storage capacity” on page 22
•“Data deduplication” on page 23
Overview
The HP StorageWorks D2D Backup System is an iSCSI disk-based storage appliance that emulates up
to six tape devices, which can be used to back up host network servers or PCs. Each tape device
is configured as an Ultrium Tape Library or Autoloader. An emulation type is selected during initial
configuration and this determines the maximum number of slots that may be configured for the device.
The default configuration emulates the HP StorageWorks 1/8 G2 Ultrium Tape Autoloader.
1. Power On button/LED 4. System health LED
2. Hard disk drives 5. LAN port 1 LED
3. HP D2D Beacon LED 6. LAN port 2 LED
Figure 1 Front view of the HP D2D Backup System
D2D Backup System HP D2D2503 17

1. Power supply cable socket 5. PCIe slots (one full and one low profile)
2. LAN port 1 6. VGA port for system console monitor
3. LAN port 2 7. PS/2 ports for system console keyboard and mouse
4. Management LAN port (Do not connect to this port)
Figure 2 Rear view of the HP D2D Backup System
NOTE:
One full PCIe slot has a SmartArray RAID controller card pre-installed. The other slot is available for
optional Tape Attach.
Optional tape attach
An external or rackmount Ultrium Tape Drive may be attached directly to the HP D2D Backup System,
allowing the user to store backups offsite. Both SAS and SCSI tape drives are supported and require
installation of a host bus adapter (HBA). External tape drives may be half-height or full-height. Rackmount
tape drives are installed in a rackmount enclosure, such as a 1U Rack, 3U Rack or a TapeArray.
To find out which Ultrium Tape Drive models and HBAs are supported, refer to
http://www.hp.com/go/connect or http://www.hp.com/go/ebs.
Software and hardware requirements
Refer to http://www.hp.com/go/connect or http://www.hp.com/go/ebs 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 backup and restore you need software that supports tape autoloaders and libraries. This
software resides on the host, not the HP D2D Backup System. The device may be used with the
major backup applications from HP, Symantec, EMC, Computer Associates and others.
18 Before you start

Terminology
Autoloaders
An autoloader is a backup device that has a single tape drive and multiple storage slots. (A library has
multiple tape drives, see “Libraries” on page 21.) Each storage slot contains a cartridge that 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.
Backup devicesandslots
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.
The HP D2D supports the following emulation types: HP 1x8 G2 Autoloader, HP MSL Library (2x24), HP
MSLLibrary(4x24)andD2DBSGenericLibrary(48slots).Thedefaultof1x8G2Autoloaderiscorrect
for many applications. (The number of drives is always restricted to 1, regardless of emulation type.)
See also “Devices (Configuration)”onpage90.
When you configure your HP D2D Backup System with a tape library, the drive emulation type that you
select determines the amount of physical disk space that is made available for each configured slot.
LTO-2defaultsto200GB,LTO-3defaultsto400GBandLTO-4defaultsto800GB.Thisistheequivalent
of a tape library with multiple slots, each containing a 200, 400 or 800 GB cartridge. Both tape
spanning and, more importantly, flexible tape rotation strategies are possible.
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.
Deduplication
Data deduplication compares blocks of data being written to the backup device with data blocks
previously stored on the device. If duplicate data is found, a pointer is established to the original data,
rather than storing the duplicate data sets. This removes, or “deduplicates,” the redundant blocks. See
also “Data deduplication” on page 23.
Emulation types
HP D2D products emulate a range of physical Tape Autoloaders or Tape Libraries. Supported emulation
types are listed below:
•HP 1x8 G2 Autoloader
•HP MSL2024 Library
•HP MSL4048 Library
•HP D2DBS Library
If it is supported by your backup application, HP D2DBS Library is the preferred emulation type to be
used because it does not emulate any physical library types in existence and is clearly identifiable as a
D2D device. It is the most flexible emulation type available; however, backup application support varies
by software vendor. See also “Emulation types for tape devices” on page 91.
HostsonanEthernetnetwork
Each emulated backup device is uniquely mapped to an individual host; this is the network server or
PC that you wish to back up.
•The backup device appears to the host as a locally-attached tape autoloader or library.
•The backup device is accessed and managed from the backup software running on the host.
D2D Backup System HP D2D2503 19

•The backup device is not visible to other devices on the network.
•Multiple servers may not back up to a single backup device.
Figure 3 on page 20 shows a configuration with a single host. The Installation wizard has been run
on Host 1. The HP D2D Backup System automatically generates a library for the host. The user may
specify the number of slots during installation.
LAN
Host3Host2 Host4/5/6Host1
HP StorageWorks D2D Backup System
Library 1
Figure 3 Device configuration with one host
•Bydefault,onlyonedeviceisvisibletothehost,thelibrarythathasbeenconfigured for it during
installation. Data from each host goes to its corresponding library.
•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).
Figure 4 on page 21 shows a configuration with three hosts. The HP D2D Backup System can be used
to back up a maximum of six hosts. The Installation wizard automatically generates a library for each
host. The user may specify the number of slots during installation.
20 Before you start