Getting Started Guide hp StorageWorks iSCSI SR2122 storage router Third Edition (September 2003) Part Number: AA-RTE1C-TE This document describes the integration of IP-based Storage Networks using the iSCSI protocol to HP StorageWorks Fibre Channel SANs and HP Storage arrays. The HP SR2122 iSCSI Router is used to bridge from TCP/IP hosts to Fibre Channel storage. For the latest version of this document, access the HP storage website at: http://www.hp.com/country/us/eng/prodserv/storage.html.
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About this Document About this Document This section describes the content reflected in this document, including: ■ Getting Started Guide Information, page 3 ■ Intended Audience, page 3 ■ Other iSCSI SR2122 Storage Router Documentation, page 3 Getting Started Guide Information This Getting Started Guide covers the following major topics: ■ iSCSI in a Heterogeneous SAN, page 6 ■ SR2122 Hardware and Software Support, page 9 ■ SR2122 Configuration Rules, page 11 ■ Configuring the SR2122 iSCSI Sto
About this Document Figures Figure 1:IP/FC Network Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2:GUI Display of the FC port WWPN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 3:Standalone SR2122; Single SAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 4:Standalone SR2122; Dual SANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About this Document iSCSI Protocol The SCSI transport protocol iSCSI maps block-oriented (CDB) storage data over TCP/IP networks (through iSCSI PDUs). The iSCSI protocol enables universal access to storage devices and storage-area networks (SANs) over standard Ethernet-based TCP/IP networks. These networks may be dedicated networks or may be shared with traditional Ethernet applications.
iSCSI in a Heterogeneous SAN iSCSI in a Heterogeneous SAN Although the iSCSI protocol is written as a complete data transport from host to storage this chapter will only discuss the current HP supported topology of iSCSI hosts to Fibre Channel storage using the HP SR2122 iSCSI Router. For further details please read “HP StorageWorks iSCSI storage router 2122 User Guide PN: 304835-002” Section 4 -SCSI Routing Overview.
iSCSI in a Heterogeneous SAN iSCSI Initiator The IP host, or iSCSI Initiator uses the iSCSI Driver to enable target resource recognition & attachment to the SR2122 over IP. The iSCSI driver is configured with the Gigabit Ethernet IP address of each SCSI routing instance running on the SR2122 with which the host is to transport SCSI requests and responses. The iSCSI initiator sees the storage resources (LUNs) as if they were just local drives attached directly to the server.
iSCSI in a Heterogeneous SAN Fibre Channel SAN A Storage Area Network is a dedicated, centrally managed, secure information infrastructure, which enables any-to-any interconnection of servers and storage. SANs are built to incorporate the best of both storage and networking interfaces: fast and efficient communications optimized for movement of large amounts of data, but with access to a wide range of other servers and storage devices on the network.
SR2122 Hardware and Software Support SR2122 Hardware and Software Support This section lists the hardware, devices, and operating systems that are compatible with this SR2122 Storage Router.
SR2122 Hardware and Software Support Microsoft Initiator Support ■ Windows 2000 server only with SP3 ■ Microsoft Windows 2003 ■ MSCS not supported ■ Secure Path & Auto Path not supported ■ IA64 not supported ■ iSNS server not supported Compaq Network Teaming Software Support ■ Compaq Network Teaming (Windows 2000 and Windows 2003 only) SR2122 Management Software Support The following HP management software is supported: 10 ■ Compaq Insight Manager 7 ■ HP OpenView Storage Area Manager (SA
SR2122 Configuration Rules SR2122 Configuration Rules SR2122 Router Rules Table 1: SR2122 Router Rules Maximum scsirouter instances per SR2122 Router (and per SR2122 Router Cluster) 12 Maximum iSCSI host connections per SR2122 SCSI Router instance 32 Maximum active targets per SR2122 Router 100 ■ The SR2122’s 2nd fibre Channel port (FC2) is not supported as a redundant SAN port for FC1. ■ Direct connect of the SR2122 FC ports to any HP storage array is not supported.
SR2122 Configuration Rules Storage Array Rules ■ The HSG80 is supported in both SCSI-3 Transparent Failover Mode and Multibus Failover Mode. ■ Without HP Secure Path the Enterprise Virtual Array is supported with the SR2122 accessing only one EVA controller port. This will disable controller failover protection. ■ The MSA1000 is supported with the SR2122 accessing only one MSA controller port. This will disable controller failover protection.
Configuring the SR2122 iSCSI Storage Router in a SAN Configuring the SR2122 iSCSI Storage Router in a SAN Configuring the SR2122 in a SAN takes on five distinct steps or sections: ■ Setup/configuration of the SR2122 itself ■ Adding the SR2122 to a SAN – standalone or clustered ■ Serving storage to the SR2122 from the storage arrays over Fibre Channel ■ Serving storage to the iSCSI Initiators from the SR2122 over IP.
Configuring the SR2122 iSCSI Storage Router in a SAN To find the WWPN of a FC ports using the SR2122’s GUI, click on the FC port in the Monitor window: Figure 2: GUI Display of the FC port WWPN Adding a Standalone SR2122 to a SAN The two SR2122 FC ports are recognized as F-Ports by the FC switch and as FC HBAs by the Storage Arrays. Ports FC1 and FC2 may be used but they cannot be served the same LUN from the same storage array, as multi-pathing is currently not supported.
Configuring the SR2122 iSCSI Storage Router in a SAN Figure 4: Standalone SR2122; Dual SANs Adding a Clustered SR2122 to a SAN The two SR2122 FC ports on all the clustered SR2122’s are recognized as F-Ports by the FC switch and as FC HBAs by the Storage Arrays. After physically connecting the FC port(s), and if zoning is enabled, it is recommended to create a new zone that includes the FC Port WWPNs and the WWPNs of the storage arrays that will be serving storage to the SR2122.
Serving Fibre Channel Storage to the SR2122 Serving Fibre Channel Storage to the SR2122 Once the SR2122 is properly configured, connected and zoned within the SAN, the next step is to present storage to the router. Where normally the storage is presented to a server, we must first get the FC storage to the SR2122, then we have to present that storage to the iSCSI Initiators over IP. As previously mentioned, the SR2122 FC ports look like a typical Fibre Channel Host Bus Adapter to the storage array.
Serving Fibre Channel Storage to the SR2122 Box 1, Bay 6, (SCSI bus 0, SCSI id 5) Box 1, Bay 7, (SCSI bus 0, SCSI id 8) Box 1, Bay 8, (SCSI bus 1, SCSI id 0) Box 1, Bay 9, (SCSI bus 1, SCSI id 1) Box 1, Bay 11, (SCSI bus 1, SCSI id 3) Logical Volume Raid Level: PARITY FAULT TOLERANCE (Raid 4) stripe_size=32kB Logical Volume Capacity: 138,927MB To present Unit 1 to the SR2122, the command would be: MSA1000> add acl wwpn=28000002-3d071bc0 unit=1 Allowing 28000002-3d071bc0 access to unit 1.
Serving Fibre Channel Storage to the SR2122 The Show Connections command will now display: HSG80> show connections ISRFC1-P1 WINNT HOST_ID=1000-0002-3D07-1E60 OTHER 1 0D0F00 OL other ADAPTER_ID=2800-0002-3D07-1E60 80 ISRFC1-P2 WINNT HOST_ID=1000-0002-3D07-1E60 THIS 2 0D0F00 OL this ADAPTER_ID=2800-0002-3D07-1E60 180 Next, an HSG80 Volume Unit can be assigned to the SR2122’s FC port WWPN using the connection name.
Serving Fibre Channel Storage to the SR2122 Note: If using SR2122 Cluster mode the WWPN for a FC port on each SR2122 cluster member must be added to the HSG80 Unit. The SR2122 should now be able to present D81 as storage to iSCSI Initiators. Presenting Enterprise Storage Array (EVA) LUNs to the SR2122 Enterprise Virtual Array (HSV110) storage volumes must be pre-configured before the LUN(s) can be detected and recognized by the SR2122.
Serving Fibre Channel Storage to the SR2122 Click button to save host information. Your host entry should now look like this: Figure 6: Host Properties After the Host entry is created it must be assigned to a LUN. To assign the Host entry to a LUN, click on the Active icon under the LUN name in the Virtual Disk folder. In the Content frame click on the button: Step 1: Use the pull down menu and find the newly created host entry and select it. Click 20 to save the entry.
Serving Fibre Channel Storage to the SR2122 Figure 7: Virtual Disk Properties Entry Note: If using SR2122 Cluster mode the WWPN for a FC port on each SR2122 cluster member must be added to the HSV110 Unit. The SR2122 should now be able to present ‘iSCSI DISK04’ as storage to iSCSI Initiators. Presenting VA LUNs to the SR2122 VA storage volume must be pre-configured before the LUN(s) can be detected and recognized by the SR2122.
Serving Fibre Channel Storage to the SR2122 Presenting XP LUNs to the SR2122 XP storage volume must be pre-configured before the LUN(s) can be detected and recognized by the SR2122. The XP can be configured either through the XP console (SVP) or Command View XP. Note: Although XP's HP Storage Works Secure Manager XP can configure XP LUNs to be selectively presented for SR2122's FC port, it is not supported at this time.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Serving Storage to the iSCSI Initiators from the SR2122 over IP Up to this point, this chapter has described the SR2122 and its impact on the fibre channel SAN. It’s now time to turn our attention to the IP side of the router. SR2122 Devices Regardless of the SR2122 being in a Standalone or Cluster configuration once storage is presented to a SR2122, the SR2122 node should recognize these new devices.
Serving Storage to the iSCSI Initiators from the SR2122 over IP For example: Table 3: SR2122 Access List Host Name IP address iSCSI03 16.117.74.66 Prod_Server15 16.222.21.44 Lab203_Server 16.120.232.32 Each SR2122 router must have an access list entry for each iSCSI initiator Access List entries may be created through the SR2122 GUI or using CLI commands.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 8: Access List Entry Enter the iSCSI Initiator name and click ADD. Figure 9: iSCSI Initiator Name Enter the iSCSI Initiator IP address and IP mask and click ADD.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 10: iSCSI Initiator IP Address The Access List entry will now display. Figure 11: Completed Access List Entry SR2122 SCSI Router Instances Presenting SAN storage over IP to the iSCSI Initiators from the SR2122 is done by creating a SCSI Router Instance within the SR2122.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 12: SCSI Router Instance Structure SCSI Router Instance – Contains the IP address used by the iSCSI Initiator, the SR2122 GbE interface port to use, authentication information, and Target Mapping. A SCSI Router Instance may have more than one Target assigned to it. Target – Contains the Access List Entry and LUN Mapping. A Target may have more than one LUN assigned to it.
Serving Storage to the iSCSI Initiators from the SR2122 over IP SR2122> scsirouter iSCSI03_Disks password "none" SR2122> scsirouter iSCSI03_Disks primary "none" SR2122> scsirouter iSCSI03_Disks reserveproxy disable SR2122> scsirouter iSCSI03_Disks failover secondary none SR2122> scsirouter iSCSI03_Disks lun reset no SR2122> scsirouter iSCSI03_Disks serverIf ge1 33.33.33.101/255.255.255.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 13: SCSI Router Instance Name and Description Enter the Target name, Access List entry, click the LUN Mapping radio button and click Add. Figure 14: Add Target Name and Access List Entry At the Configure LUNs screen click Add LUN.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 15: Configure/Add LUN At the Add New LUN screen enter the SCSI LUN number that will be presented to the iSCSI Initiator, click the WWPN radio button and select the appropriate storage controller WWPN with the LUN number from the primary pull down menu and click Add. Figure 16: Add New Lun The browser will return to the Configure LUNs screen. Click the Add button and add the 2nd LUN for this Target.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 17: Add Second LUN After Clicking Add the browser will return you to the Configure LUNs screen displaying the two newly created LUNs. Figure 18: New LUNs Click on SCSI Routers to display all SCSI Router Instances.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 19: All SCSI Router Instances Click on the newly created Instance, iSCSI03. Figure 20: Instance iSCSI03 Add ge2 from the Secondary Interface pull down menu, add the SCSI Router Instance IP address and its Netmask, then click Apply.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 21: Secondary Interface The SCSI Router Instance is now available on the IP network for iSCSI Initiator iSCSI03 to connect to once the iSCSI03 has its iSCSI driver loaded and configured. Note: Do not configure more than 8 XP LUNs into a target in a SCSI Router Instance. LUNs for other devices have no such restriction.
Serving Storage to the iSCSI Initiators from the SR2122 over IP HP iSCSI Initiator Setup for Windows 2000 and Windows 2003 The iSCSI driver provides a transport for SCSI requests and responses for storage devices; however, instead of providing a transport for directly attached devices, the driver transports the SCSI requests and responses between the IP host and the SR2122 via an IP network. The SR2122, in turn, transports SCSI requests and responses between it and the storage devices attached to it.
Serving Storage to the iSCSI Initiators from the SR2122 over IP After the iSCSI Initiator reboot the iSCSI Configuration application can be found in the Control Panel. Figure 23: iSCSI Configuration Application Click on the ‘hp iSCSI Config’ icon to return to the iSCSI Config screen. Figure 24: iSCSI Configuration Screen The Status button is used to display iSCSI connection status to the SCSI Router Instance IP address and it’s associated Targets.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 25: iSCSI Connection Status The other button options: Add: Used to define the IP addresses of iSCSI target nodes. Enter an IP address for each additional SCSI Router Instance and click Add. Click Save when you are done adding IP addresses. A Reboot is necessary for the new configuration to take affect. Remove: Used to remove already defined target node IP addresses. Select the IP address to remove and click Remove.
Serving Storage to the iSCSI Initiators from the SR2122 over IP during driver installation to minimize that problem. The files can be used to automatically activate certain system features after the iSCSI devices are present. Please refer to the instructions at the beginning of the actiscsi.vbs file for detailed installation information and procedural steps. Once the iSCSI driver is installed, the IP host will proceed with a discovery process for iSCSI storage devices as follows: 1.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Microsoft iSCSI initiator Setup for Windows 2000 and Windows 2003 Server Please download the iSCSI driver from Microsoft's download page, and follow the install instructions to complete the installation. Once installed, you can refer to the user guide document in C:\Program Files\Microsoft iSCSI Initiator\uguide.doc to set up iSCSI targets presented by SR2122.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 27: Add Target Portal Next, click on the Available Targets tab to list the targets found through the Available Portals. The Status should be Inactive. Next, log into the target to discover the SR2122 LUNs by selecting a Target and clicking on Log On.
Serving Storage to the iSCSI Initiators from the SR2122 over IP The Target Staus should change to connected. To verify that the server is now connected to the SR2122 LUNs click on the Active Sesisons tab, highlight the connected Session and click on the Details button.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 30: Session Details The iSCSI driver should now display all luns that are presented from the SR2122 target. Enter Window's Disk Management application and it should now report new disks and ask to write a signature. At this point you would treat these drives as you would any locally attached block-level disk (create partition, format, etc.).
Serving Storage to the iSCSI Initiators from the SR2122 over IP 4. Update /etc/iscsi.conf to include the IP addresses for your iSCSI targets. A sample configuration file might include entries like this: DiscoveryAddress=33.33.33.101 The iscsi.conf man page has a more detailed description of the configuration file format. To read the man page, type: man iscsi.conf 5. Manually start iSCSI services to test your configuration. /etc/rc.d/init.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Under /dev/iscsi, there will be a directory tree containing subdirectories for each iSCSI bus number, each target id number on the bus, and each logical unit number for each target. For example, the whole disk device for bus 0, target id 0, LUN 0 would be /dev/iscsi/bus0/target0/lun0/disk In each logical unit directory there will be a symbolic link for each SCSI device node that may be connected to that particular logical unit.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Mounting File systems Because the Linux boot process normally mounts file systems listed in /etc/fstab before the network is configured, adding mount entries in iSCSI devices to /etc/fstab will not work. The script iscsi-mountall will manage the checking and mounting of devices listed in the file /etc/fstab.iscsi which has the same format as /etc/fstab. This script is automatically invoked by the iSCSI startup script.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Each line will show the Linux host number, channel number, target id number, and logical unit number, as well as the IP address, TCP port, and iSCSI TargetName. If an iSCSI session exists, but no LUNs have yet been found for a target, the LUN number field will contain a question mark. If a TCP connection is not currently established, the IP address and port number will both appear as question marks.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 31: Secure Path configuration example After configuring the SR2122 in Standalone, the following steps are necessary. ■ SAN/Storage Setup ■ SR2122 Setup ■ Secure Path Setup ■ iSCSI Initiator Setup Note: For setup examples, the SR2122 members are Node A and Node B. The two SAN fabrics will be called the Ring and the Tree.
Serving Storage to the iSCSI Initiators from the SR2122 over IP The FC ports emulate a FC HBA on the SAN fabric. Create a zone on each fabric that includes the SR2122 FC port and the storage controllers you want the SR2122 to access. Setup for EMA/ESA12000, EMA16000, MA/RA8000, MA6000 If the ports of HSG80 controller-based storage are zoned with both Node A and Node B SR2122 routers, the storage will see two paths or connections per SR2122 FC port for a total of 4 connections.
Serving Storage to the iSCSI Initiators from the SR2122 over IP SR2122 Setup Once storage is presented to Node A and Node B, each SR2122 node should recognize these new devices. If not, the SR2122 can be forced to rescan for devices either through its management GUI within the Monitor Window or through the CLI command "Show Devices Rediscover". With both the HSG80 and HSV110/100 controllers, a single LUN will appear twice in each of the SR2122's Device List.
Serving Storage to the iSCSI Initiators from the SR2122 over IP NodeA> scsirouter iSCSI03_Disks primary "none" NodeA> scsirouter iSCSI03_Disks reserveproxy disable NodeA> scsirouter iSCSI03_Disks failover secondary none NodeA> scsirouter iSCSI03_Disks lun reset no NodeA> scsirouter iSCSI03_Disks serverIf ge1 33.33.33.103/255.255.255.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Router Target Status Accesslist Targetid Description Profile ---------- ---------------- -------- ---------- ---------- ----------- ------iSCSI03_Disks HSV23_T1 enabled iSCSI03 none (not set) High Router Target WWPN Primary I/F WWPN Secondary I/F Alias ---------- ---------------- ---------------- ----- ---------------- ----- ----iSCSI03_Disks HSV23_T1 none none iqn.1986-03.com.hp: fcgw.sr2122.3b6128603a94e42a2f66acd8a2601971.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Follow the prompts on the screen and accept the license agreement and at the iSCSI Configuration screen, you may enter the SCSI Router Instance IP addresses that the iSCSI Initiator is to use for storage. An iSCSI Initiator may communicate with up to eight SCSI Router Instances. A system reboot is necessary after the driver installation.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 33: Checking that SR2122 Targets are Active The system may also report a new disk found and ask to write a signature. At this point you would treat this drive as you would any locally attached disk (create partition, format, etc.). Verify the correct numbers of paths to this disk with Secure Path Manager.
Serving Storage to the iSCSI Initiators from the SR2122 over IP Figure 35: MSCS Cluster with SR2122 Routers Example As a SR2122 Access List Entry may contain multiple IP addresses, the first step is to create an Access List Entry on the SR2122 that contains the IP address of all MSCS cluster members. These addresses can be either IP addresses assigned to a physical NIC card or an IP address assigned to a Virtual Network Adapter or "Teamed" adapters.
Serving Storage to the iSCSI Initiators from the SR2122 over IP SR2122 Name Access List Entry name Access List Entries Node A ArticX-Cluster 33.33.33.01 33.33.33.02 Node B ArticX-Cluster 33.33.33.01 33.33.33.02 Note: The Access List Name assigned to the IP address does not necessarily have to be the IP address's DNS name. The iSCSI Target(s) on both SR212 routers must contain the same MSCS Cluster Access List Entry to ensure proper failover/failback of the iSCSI disk drives.
Serving Storage to the iSCSI Initiators from the SR2122 over IP After the MSCS cluster reboots enter hp iSCSI Config again on each cluster member and check the Status of the driver to verify both the SR2122 targets are active. Verify the correct numbers of paths with Secure Path Manager to each cluster member.
SR2122 / Insight Manager 7 Service Pack 2 Integration SR2122 / Insight Manager 7 Service Pack 2 Integration The purpose of this section is to describe the integration of the HP SR2122 Storage Router and Insight Manager 7 (IM 7). To IM 7, it is simply a TCP/IP device, which is discovered, data collected, and status polled.
SR2122 / Insight Manager 7 Service Pack 2 Integration Table 6: Management Server Hardware and Software Minimum Requirements (Continued) Management Server Feature Management Server Operating System Minimum Requirements Microsoft Windows NT Server 4.0 Retail with Service Pack 6a or later Microsoft Windows NT Server 4.0 Enterprise with Service Pack 6a or later Microsoft Windows NT Server 4.
SR2122 / Insight Manager 7 Service Pack 2 Integration Table 6: Management Server Hardware and Software Minimum Requirements (Continued) Management Server Feature Database Software for Server Minimum Requirements Microsoft SQL 7.0 MSDE, with Service Pack 4 or later (local upgrades only) Microsoft SQL Server 7.0 Standard, with Service Pack 4 or later Microsoft SQL Server 7.
SR2122 / Insight Manager 7 Service Pack 2 Integration Figure 37: Valid SR2122 Management Port TCP/IP Configuration Next, Network Management information must be configured: Figure 38: Network Management Configuration Of particular note is the READ Community. This allows for the IM 7 data collection to bring back the MIB II information. It also makes autodiscovery possible, by supplying the SNMP MIB II SysOID of the device for identification by IM 7.
SR2122 / Insight Manager 7 Service Pack 2 Integration If the user would like to see authentication traps (if users are speaking SNMP at the HP SR2122, with an incorrect community string) then they configure it to be enabled. Likewise, if you wish each Link state change to be sent as a trap, you must enable Link up/Down for whichever Link you wish to monitor state changes with.
SR2122 / Insight Manager 7 Service Pack 2 Integration Figure 40: Discovery Filters Manual Discovery You can also just add the device one at a time. But be aware that Device filters should be set properly to allow for network devices to be discovered.
SR2122 / Insight Manager 7 Service Pack 2 Integration SNMP Customizations SNMP Community Strings The SNMP community strings for “Monitor” and “Control” of the devices must correspond to the HP SR2122’s Read and Write Community settings. SNMP Authentication Trap Enabling By default, this trap is disabled in IM 7, meaning it is ignored and discarded. To enable it you have to edit the settings of RFC 1215.
SR2122 / Insight Manager 7 Service Pack 2 Integration Figure 43: SNMP Trap Edit Click on Enable Trap Handling then click Apply. Figure 44: SNMP Network Query You will find that the HP SR2122 is a network device and will be found via the network device query.
Sample Configurations Sample Configurations For maximum supported SAN and Storage configurations, please refer to Chapters 3 and 4 of the "HP StorageWorks SAN Design Reference Guide.
Sample Configurations Figure 46: Windows 2000 Servers with NIC Teaming: 2 Node SR2122 Cluster iSCSI SR2122 Storage Router: Getting Started Guide 65
Sample Configurations Figure 47: Maximum SR2122 Cluster Configuration Using HA Ports 66 iSCSI SR2122 Storage Router: Getting Started Guide
