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HP SAN Backup SolutionHP SAN Backup SolutionConfiguration GuideRevision 4.0October, 2002HP SAN Backup Solution Configuration Guide1
HP SAN Backup SolutionRevision History:Revision 1.0 – July 21, Initial Creation of documentRevision 2.0 – September 1, Final Review Addition of Electronic Address of this document withrevision history Addition of Omniback and Netbackup ordering details Corrections of driver versions, software versions Addition of SAN ordering example with 2 HP-UX,10/180, 4 NT, & 1 Solaris Addition of a Bibliography Updated date of Emulex and QLogic HBAs to 10/00 Info about SAN Manager DM & LM Diagram of NT, tape libraries and FC60 storage on sameSAN added Addition of the Commercial Channel and EnterpriseChannel (formerly known as SF88/SF21) part numbermatrix in Appendix ARevision 2.1 – September 20 – November 1 Add A-Class server (400/500) to supported server list Update release/support dates on Emulex, QLogic, JNIHBA releases Revision of explanation of why a 4/2 and 4/1 bridgecannot be on the same switch in a Solaris, HP-UX, and NTSAN (p. 19)Revision 3.0 – January 2001 Addition of “What’s New” section Addition of LTO drive configurations, performance tips,and product numbers Addition of the Bridge 2/1 LV information Addition of LTO drive upgrade path information Addition of disk and tape SAN configurations andexplanations Addition of information on HBA configuration(redundant, separate, common) in SAN Addition of 10/588 tape library support in a SANRevision 3.1 – January 2001 Update LTO Enterprise product numbersRevision 3.2 – June 2001 Updated “What’s New” section Added support for HP-UX 11.11and 10.20 Added HBA and platform support to include K, D, R-classservers and Superdome. Added support for the Director FC64 switch Expanded switch cascading support Added support for VA7100 in the disk and tapeconfigurationsHP SAN Backup Solution Configuration Guide Removed Windows support for the Bridge FC 4/2Removed references to Veritas Netbackup CPLinformationUpdated support statement for Storage Node Manager andStorage AllocatorRevision 3.3 – August 2001 Updated “What’s New” section Added QLogic HBA support for Windows Expanded switch cascading support to include 5 switches Added support for VA7400 in the disk and tapeconfigurationsRevision 3.4 – September 2001 Removed Enterprise and Commercial designations pernew Universal Product Merger Added support for the HP Surestore Switch 6164 Added support for Solaris 8 and new JNI cards Added support for a single overlapping tape zone Added support for disk and tape configurations with EMCSymmetrix disk arrays Added Emulex HBA support for WindowsRevision 3.5 – October 2001 Added support for Novell NetwareRevision 3.6 – December 2001 Added support for AIX Added support for ED5000 Added support 2gbit hba and the Brocade 3800Revision 3.7 – February 2002 Added Surestore Interface Manager for 10/180 and 20/700Tape Libraries Added support for 2 Gb 8-port switches Updated performance recommendations for 2 Gb HBAsRevision 4.0 – October 2002 Removed legacy tape library products and correspondinginterfaces (10/180, 20/700,etc.) Added new HP tape library product (MSL, ESL) andinterface support information2
HP SAN Backup SolutionTable of ContentsINTRODUCTION .5SAN BACKUP SOLUTION OVERVIEW.5TRADITIONAL BACKUP METHODS .5SAN BACKUP .7SAN TOPOLOGIES .8Point-to-Point .8Switched Fabric.8SAN BACKUP COMPONENTS.10HOST BUS ADAPTER .10SWITCH .10TAPE LIBRARY .10ROUTER .10CABLES AND GBICS.10BACKUP SOFTWARE .10SAN MANAGEMENT SOFTWARE .11SUPPORTED CONFIGURATIONS AND TOPOLOGIES .12PLATFORM AND OPERATING SYSTEM SUPPORT.12TAPE LIBRARIES AND FC ROUTERS.14BACKUP AND SAN MANAGEMENT SOFTWARE .15FC SWITCHES .15SAN BACKUP CONFIGURATION INFORMATION .16Cascading switches.16Inter-switch links .18Zoning.19Emulated Private Loop .19FC CONNECTIONS .20CONFIGURATIONS WITH DISK AND TAPE .21Disk and Tape using Separate Switches .21Disk and Tape using Separate Host Bus Adapters .22Disk and Tape using Common Host Bus Adapters .23Disk and Tape using both Separate and Common Host Bus Adapters .24Supported Disk Arrays.26HIGH AVAILABILITY CONFIGURATIONS .26BACKUP SIZING AND QUICKSPECS - BACKUP SOLUTIONS .31HP SAN Backup Solution Configuration Guide3
HP SAN Backup SolutionWhat’s New in This Document HP MSL and ESL Tape LibrariesHP Fibre Channel Routers for ESL and MSL Tape librariesHP FC Switches – Legacy and current switch matricesRemoval of legacy tape library and interface product informationHP SAN Backup Solution Configuration Guide4
HP SAN Backup SolutionHP SAN Backup SolutionIntroductionThis document is intended for field, resellers, system integrators, or end-users that are specifying and designing a HPSAN Backup Solution.This document provides an overview of the SAN backup solution with an emphasis on tape backup. It describessupported configurations and components for the solution, information on sizing a solution, example configurations andan ordering guide.The reader is assumed to be familiar with storage as well as have general understanding of backup including tapetechnologies, tape libraries, and backup software. The reader also is assumed to have some understanding of SAN andFibre Channel, but not specifically SAN tape backup.SAN Backup Solution OverviewTraditional Backup MethodsUntil recently, there have been two primary models for attaching tape libraries for backup and recovery. The first isthrough a backup server. Data is moved from target hosts over the network to a backup server and then to directattached tape library and tape drives.Figure 1 -- Network backup modelThe advantage of this approach is that it allows a customer to leverage shared use of a large tape library across theirenvironment. This solution can also leverage existing LAN infrastructure.HP SAN Backup Solution Configuration Guide5
HP SAN Backup SolutionThe primary limitation is that the network bandwidth often becomes a bottleneck for capacity and performance of thesystem. Additionally, backing up over the primary client LAN will often negatively impact the performance of thenetwork.In some cases, customers have deployed a dedicated network for backup separate from their primary client network.This is shown in the figure above. This mitigates the performance impact on the client network, but the solution is stilllimited by network bandwidth.Figure 2 -- Direct attached backup modelThe second commonly deployed model is direct attached backup. In this case, tape drives are connected directly to eachserver to be backed up. These tape drives may be housed in a single library in order to benefit from automated tapehandling.The benefit of this solution is high performance access to the tape drives. Large backups can be done in a short time byconnecting additional tape drives to a server.The disadvantage is that the number of tape drives available (e.g. the number of tape drives in the tape library) limits thenumber of servers that can be backed up. Also, since each tape drive is dedicated to a specific server, when that server isnot using the tape drive, another server cannot use it. This can result in a lot of backup capacity unusable throughout thebackup window.HP SAN Backup Solution Configuration Guide6
HP SAN Backup SolutionSAN BackupSAN backup provides an evolutionary step for these two models. Tape drives and libraries are connected to hosts over ahigh-speed Fibre Channel network. It combines the benefits shared access to tape drives and libraries from the networkbackup model with the benefit of high-speed access from the direct attach model.HP-UXServersSun SolarisServers22MS WindowsServersL /A22SPL/ASPU2U2L /A2120L/A21SPL /A20SPSPL/ASPU1U1L /A19L/A19SPFaultUnitIdentificationBC LA SSRunAttn.FaultDisk ADisk BRemoteIBM AIXServersPowerB Uu ntt ito Idn entificationRes S Pe w ot i wB tc eu h rttCoonnfigurationMan agem e nt LinkP Po ow wer erZ Zo on ne e1 2(D (Se ef cau onlt d) ary)To enclose aboveMan agem e nt LinkTo e ncl os e bel owN4 N3S8S7S6S5S4S8S7S6S5S4S3S2S1S3S2S1BSPN1 N2RJ-45P atchPane l PortsS8S7S6S5S4S8S7S6S5S4S3S2S1S3S2S1AAPowerHP FCSwitchesHP ESL Tape LibraryHP FC-SCSI RoutersHP Ultrium Tape DrivesHP OnlineStorageHP MSL Tape LibraryHP FC-SCSI RoutersHP Ultrium Tape DrivesFigure 3 – SAN backup diagramHP SAN Backup Solution Configuration Guide7
HP SAN Backup SolutionEach of the hosts sees what looks like its own dedicated tape drive. Backup software installed on each of the hostsmanages access to the tape drives sequencing backup jobs from multiple hosts to the pool of available tape drives.There are several significant benefits to deploying a SAN-based backup solution:High PerformanceScalabilityFlexibilityLeveraged InvestmentReduced Administrative CostsThe solution provides performance comparable to direct attach solutions. It doesnot suffer from network bandwidth limitations inherent in traditional networkbackup solutions.Tape resources are pooled and shared across all hosts in the environment. Oncethe solution is deployed, capacity is easily expanded by adding additional tapedrives to the pool.Backup capacity is readily allocated and reallocated as the environment changes.Tape drives are dedicated or locked in to specific servers as with direct attachbackup.Tape drives and libraries are pooled. These investments shared across theenterprise data center.Consolidated backup operations, centrally located and managed hardware result inless administrative effort.SAN TopologiesA Fibre Channel SAN supports several network topologies, including point-to-point and switched fabric. Theseconfigurations are constructed using switches and routers.Point-to-PointPoint-to-point connections are direct connections between two nodes, such as a server and an attached tape library. Thisconfiguration requires no switch to implement. It is very similar to a SCSI bus model, in that the storage devices arededicated to a server.Figure 4 – Point-to-point topologySwitched FabricA switched-fabric topology allows nodes to talk directly to each other through temporarily established directconnections. This provides simultaneous dedicated bandwidth for each communication between nodes (see Figure 5).HP SAN Backup Solution Configuration Guide8
HP SAN Backup SolutionBecause of this, switched fabric topologies provide significantly more performance and scalability than arbitrated looptopologies.Also, switched fabric topologies do not suffer from susceptibility to I/O interruptions due to errors, resets, or powerfailures from third party nodes. Because communications are established directly between nodes, interruption events areisolated by the fabric environment.Finally, because many nodes never need to communicate with each other, such as between two hosts, interoperabilityissues are significantly mitigated in a fabric topology as compared to loops. Nodes need only interoperate with theswitch and the target node instead of every node on the loop or fabric.Switched fabric configurations are implemented with Fibre Channel switches. Switches may be cascaded together toform larger fabrics. Switches may also be combined with hubs to form mixed fabric and loop topologies.Figure 5 – Switched FabricHP SAN Backup Solution Configuration Guide9
HP SAN Backup SolutionSAN Backup ComponentsThe following section describes the key components comprising a SAN backup solution.Host Bus AdapterHost bus adapters or HBAs are used to connect servers to fibre channel topologies. They provide a similar function toSCSI host bus adapters or network interface cards (NIC).The device driver for an HBA is typically responsible for providing support for any of the fibre channel topologies –point-to-point, loop, or fabric. In most cases, the device driver also provides a translation function of presenting fibrechannel targets as SCSI devices to the operating system. This provides compatibility with existing storage applicationsand file systems that were developed for SCSI devices.SwitchSwitches are the Fibre Channel infrastructure component used to construct fabrics. Switches may be cascaded togetherto configure larger fabrics.Switches typically have an Ethernet port for managing them over the network. This port provides status andconfiguration for the switch and individual ports.Tape LibraryThe tape library and tape drives it contains provide the offline storage for backup on the SAN. The tape library providesautomated tape handling which becomes a key requirement when consolidating backup across multiple servers.RouterThe FC-SCSI router (sometimes referred to as a bridge) device provides connection between fibre channel topologiesand SCSI devices. It does this by presenting the SCSI devices as fibre channel devices to the SAN, and then relayingfibre channel commands to these SCSI devices. These are typically used for tape drives and libraries.Cables and GBICsThree types of cables exist to connect Fibre Channel devices together – copper cables, short-wave or multi-mode opticalcables, and long-wave or single-mode optical cables. Each type of cable provides different maximum lengths, as well ascost.Fibre Channel devices have ports which either require a specific type of cable, or require a separate module referred to asa GBIC (gigabit interface converter). A GBIC-based port allows a user to use multiple types of cabling by utilizing theappropriate type of GBIC with it.Backup SoftwareBackup software is deployed on each of the hosts on a SAN that will perform backup. This typically requires installingserver-type licenses and software on each of these hosts. Many of these backup applications also provide a separateHP SAN Backup Solution Configuration Guide10
HP SAN Backup Solutionmodule or option, which enables software to manage shared access to the tape drives on a SAN. This may need to bepurchased in addition to the typical software licenses.SAN Management SoftwareSAN Management software is used to manage resources, security, and functionality on a SAN. This can be integratedwith host-based device management utilities or embedded management functionality such as hub or switch Ethernetports.HP SAN Backup Solution Configuration Guide11
HP SAN Backup SolutionSupported Configurations and TopologiesThis section provides information for each of the components of the solution, describing supported configurations andtopologies. Throughout the material, some information regarding future support is also provided.Platform and Operating System SupportThe following table lists supported host platforms. Reference this list for platform supportability throughout thisdocument.Table 1 – Operating Systems and PlatformsOperating SystemHP-UXSolarisWindows NT 4.0 Server,NT Enterprise EditionWindows 2000 Server,Advanced ServerVersion11.1111.0 (32 & 64 bit)10.20ServersHP 9000-800 A-, V-, N-, and L–class serversHP 9000-700 K-, D-, and R–class serversSuperdome, rp80002.6, 7, 8Sun Ultra Enterprise, Enterprise, Ultra24.0 SP6SP2, SP3HP NetServers, HP Proliant, Dell PowerEdge, andIBM Netfinity, Compaq ProliantHP NetServers, HP Proliant, Dell PowerEdge, andIBM Netfinity, Compaq ProliantIBM AIX4.3.3 ML09RS6000 serversNovell Netware5.xHP NetServers, HP Proliant, Dell PowerEdge, andIBM Netfinity, Compaq ProliantHeterogeneous platform tape sharing is supported. All platforms may be connected through one or more switches to atape library. The switches do not need to be separated by operating system type, nor should they be configured withseparate zones for each operating system.All hosts need to “see” all tape drives; shared access to tape drives is handled by the backup application software runningon each host. Software requirements and supportability may vary from one platform to another. Check the softwarevendors’ support matrices for platform information.HP SAN Backup Solution Configuration Guide12
HP SAN Backup SolutionTable 2 – Supported host bus adaptersVendorHewlett PackardJNIQLogicEmulexCompaqIBMProduct No.Operating SystemsA5158AHP-UX 11.0, 11.11A6795AHP-UX 11.0, 11.11A6684AHP-UX 11.0, 11.11, 10.20A6685AHP-UX 11.0, 11.11, 10.20FC64-1063N (sbus)FCI-1063N (pci)FCE-1063-N (sbus)FCE-6410-N (pci)Solaris 2.6, 7, 8Driver 2.5.18Solaris 2.6, 7, 8Driver 4.0.5LP8000LP952L176479-B21245299-B21Windows NT 4.0, Windows2000Windows NT 4.0, Windows2000Windows NT 4.0, Windows2000FC6228AIX 4.3.3QLA-2200FDrivers / Notes11.11 Driver AR 1201 & PHKL 2362611.0 Driver AR 1201 & PHKL 2393911.11 Driver AR 1201 & PHKL 2362611.0 Driver AR 1201 & PHKL 2393911.11 Driver AR 1201 & PHKL 2362611.0 Driver AR 1201 & PHKL 2393911.11 Driver AR 1201 & PHKL 2362611.0 Driver AR 1201 & PHKL 2393910.20 DART 54 Patch DependenciesJ3630BA, PHSS 23581, PHKL 17590,PHKL 167511Driver 8.00.08NT Driver 4-4.82a4Win2k Driver 5-4.82a4NT Driver 4-4.82a4Win2k Driver 5-4.82a4Firmware 3.82A1, Driver 4.3.3.75 (64-bitPCI FC Adapter Device device.pci.df1000f9.rte)FDA Fabric Direct Attach (aka N-Port)For an up-to-date list of required driver and firmware revisions, please check the website, http://www.hp.com or callyour local HP representative regarding SAN backup configurations installation options.HP SAN Backup Solution Configuration Guide13
HP SAN Backup SolutionTape Libraries and FC RoutersThe following tables lists the libraries, tape drives, and FC interface routers supported for the SAN tape backup solution.This table references MSL- and ESL-class tape libraries. Supported tape drives for use in SAN backup solution withthese automated libraries is shown in Table 3a.Table 3 – Tape LibrariesProduct No.Tape Library 8301932-B22301932-B28MSL5030, 0 DRV, RM LibraryMSL5030, 1 DRV, LTO Ultrium 230, RM LibraryMSL5030, 2 DRV, LTO Ultrium 230, RM LibraryMSL5030, 1 DRV, LTO Ultrium 230, embedded Fibre, RM LibraryMSL 5030, 2 DRV, LTO Ultrium 230, embedded Fibre, RM LibraryMSL5030, 1 DRV, LTO Ultrium 230, TT LibraryMSL5030, 2 DRV, LTO Ultrium 230, TT LibraryMSL5060, 0 DRV, Ultrium 230, RM LibraryMSL5060, 2 DRV, Ultrium 230, TT LibraryMSL5060, 2 DRV, Ultrium 230, RM LibraryMSL5060, 2 DRV, Ultrium 230, embedded Fibre, RM LibraryESL9322 222 slot 2 LTO Ultrium 230 Drive Enterprise LibraryESL9322 222 slot 8 LTO Ultrium 230 Drive Enterprise LibraryESL9322 322 slot 2 LTO Ultrium 230 Drive Enterprise LibraryESL9322 322 slot 8 LTO Ultrium 230 Drive Enterprise LibraryESL9595L1 400 slot 2 LTO Ultrium 230 drives Enterprise LibraryESL9595L1 400 slot 16 LTO Ultrium 230 drives Enterprise LibraryESL9595L1 500 slot 2 LTO Ultrium 230 drives Enterprise LibraryESL9595L1 500 slot 16 LTO Ultrium 230 drives Enterprise LibraryESL9595L1 595 slot 2 LTO Ultrium 230 drives Enterprise LibraryESL9595L1 595 slot 16 LTO Ultrium 230 drives Enterprise 1p53.31p53.31p53.31p53.31p5Table 3a – Supported Tape DrivesProduct No.Tape Drive DescriptionFirmwareVersions-HP Ultrium LTO 230-Table 4 – Fibre channel interfacesPart -B21DescriptionSupported Tape LibrariesFirmwareversionsM2402 Network Storage Router2 FC x 4 LVD SCSIE2400 Embedded Data Router2 FC x 4 LVD SCSI portsE1200 Network Storage router1 FC x 2 LVD SCSIN1200 Network Storage router1 FC x 2 LVD SCSIESL 9000 Tape LibrariesMSL5000 Tape Libraries4.03.16ESL 9000 Tape Libraries4.03.16HP SAN Backup Solution Configuration GuideESL 9000 Tape LibrariesMSL 5000 Tape LibrariesESL 9000 Tape LibrariesMSL 5000 Tape Libraries4.03.164.03.1614
HP SAN Backup SolutionNote: The upgrade router kit includes: two 1FC x 2LVD SCSI router cards, four VHDCI-WIDE SCSI cables, UserGuide CD. This SKU does not include a card cage; it is an upgrade SKU and requires 262665-B21 to be configuredfirst, when configured it increases the number of SCSI ports available to connect drives in an ESL9000 library to theSAN, to a total of eight.For LTO connectivity it is recommended that drives are connected to routers in a configuration of one tape drive perSCSI bus with a maximum of 2 drives per SCSI bus.The number of tape drives configured in the library determines the number of external FC bridges or internal FCinterface cards required. Due to performance and reliability concerns, it is recommended that no more than two tapedrives be connected per SCSI bus on a fibre channel router. For ESL tape libraries with a full capacity of tape drives,two tape drives per bus is required since the maximum number of buses is reached with the embedded FC routers.Backup and SAN Management SoftwareTable 5 – Supported Backup and SAN ManagementSoftwareSoftwareVersionsPlatforms SupportedHP Omniback II4.0, 4.1HP-UX, Solaris, MS Windows, NetWare, IBM AIXHP Openview Storage DataProtector5.0HP-UX, Solaris, MS Windows, NetWare, IBM AIXVeritas Netbackup3.4.3HP-UX, Solaris, MS Windows, IBM AIXLegato6.1.2HP-UX, MS WindowsVeritas BackupExec8.6MS WindowsBuild 16MS Windows2.2See HP Blueprints for OV-SAM for more information onOpenView Storage Manager configuration supportComputer AssociatesARCserve 2000HP OpenView StorageManager (OV-SAM)FC SwitchesThe following table provides a list of the supported FC switches for the SAN backup solution.Table 6 – Supported FC SwitchesProduct NoA7340AA7347A (A7346A1)A5624AA5625AA5667A1DescriptionHP FC 1Gb/2Gb 16B switchBrocade Silkworm 3800HP FC 1Gb/2Gb 8B switchBrocade Silkworm 3250 (3240)Ports168HP/Brocade Silkworm 280016HP/Brocade Silkworm 24008Firmware Versions3.0.2fA2.4.1A2.4.1Note the A7346A is an entry-level switch with no zoning support and limitations for cascading.HP SAN Backup Solution Configuration Guide15
HP SAN Backup SolutionA6534AA6534AZA7326AA7326AZ-01.01.02, 1.3HP Director FC6464HP Switch 616464McData ED5000324.0-Connectrix ED-1032324.0-McData ES-323232-HP SAN Switch 2/1616HP SAN Switch 2/8-ELHP Edge Switch 2/32HP Edge Switch 2/16HP Director 2/64HP Core Switch 0.0202.00.0202.00.024.0.0cSAN Backup Configuration InformationCascading switchesSwitches may be used alone, or cascaded to provide additional host connectivity.The figure below provides a simple example SAN backup configuration.HP-UXHostSolarisHostWindowsHostHP FC Switch21HP TapeLibrary andFC RoutersFigure 6 – Shared tape library with HP-UX, Solaris, and NTHP SAN Backup Solution Configuration Guide16
HP SAN Backup SolutionAnother configuration example demonstrating supported cascaded switch configurations is shown in Figure 7. Thistopology allows configurations to be created with a single switch serving as a ‘storage’ switch in the center of thetopology to which disk storage and tape libraries are connected. Up to four additional ‘host’ switches are connected tothe ‘storage’ switch and provide for a larger number of hosts to be connected to the topology. Hosts may also beconnected to the ‘storage’ switch, in addition to the ‘host’ switches.HostHostHostHostHost switchesStorage switch21Tape LibraryFigure 7 – Fan-out cascaded switch configurationHP SAN Backup Solution Configuration Guide17
HP SAN Backup SolutionHostHostCurrent support for meshed switches in a SAN backupconfiguration is limited to a 6-switch mesh (or one HP6164 switch) with HP/Brocade 8-/16-port switches anda maximum of three hops between the hosts and thestorage.Mixing switch vendors’ products is not supported.8-portSwitches21Tape LibraryFigure 8 –Support for meshed switchesInter-switch linksConnections made between switches in order to cascade them are referred to as Inter-switch links (ISL). Multiple ISLsmay be used between switches to provide additional bandwidth and improve network performance as shown in Figure 9.An ISL is recommended for every four HP Ultrium Tape Drives connected to the fabric.HP SAN Backup Solution Configuration Guide18
HP SAN Backup SolutionHostHostHost8-portSwitchesISLs21Tape LibraryFigure 9 – Multiple inter-switch links (ISLs)ZoningZoning refers to the ability to partition the switch into multiple logical SANs. This feature is primarily supported fordisk and tape configurations. Shared access to tape drives is handled by the backup application software running on eachhost. As such, generally any tape-related zones need to be configured to allow all hosts to see all tape drives andlibraries.Zoning is not used for the purpose of isolating I/O traffic in the SAN or fibre channel events from a third-party host suchas LIPs. These events are automatically isolated through the switch and fabric topology.Overlapping zones refer to a configuration where a single switch port or device WWN participates in more than onezone. Support has been recently added to allow for a single overlapping tape zone in order to provide flexibility forcustomers using zoning for disk storage needs.Emulated Private LoopEmulated Private Loop (EPL) is a feature that allows a switch to emulate a hub and provide private arbitrated loopconnectivity for non-public hosts or devices. Brocade refers to this feature in their switches as Quickloop.Due to potential for LIPs to interrupt an I/O during a tape backup, this feature is NOT supported for tape devices.SAN Backup Solution Configuration Guide19
HP SAN Backup SolutionFC ConnectionsOnly short-wave optical c
HP SAN Backup Solution HP SAN Backup Solution Configuration Guide 5 HP SAN Backup Solution Introduction This document is intended for field, resellers, system integrators, or end-users that are specifying and designing a HP SAN Backup Solution. This document provides an overview of the SAN backup solution with an emphasis on tape backup.
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