HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 263
iSCSI Switch Attach Configuration, C-6
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iSCSI Switch Attach Configuration The high-availability configuration requires two gigabit Ethernet (GbE) switches. During active-active operation, both controllers' mapped volumes are visible to both data hosts. A dual-controller MSA2012i storage system uses port 0 of each controller as one failover pair and port 1 of each controller as a second failover pair. If one controller fails, all mapped volumes remain visible to all hosts. Dual IP-address technology is used in the failed-over state, and is largely transparent to the host system.The following figure shows how port IP addresses and mapped volumes are presented when both controllers are active. A0 IP, B0 IP, A & B volumes A1 IP, B1 IP, A & B volumes Ethernet switch A0 IP, A volumes A1 IP, A volumes A0 A1 B0 B1 B0 IP, B volumes B1 IP, B volumes Figure C-6 iSCSI Storage Presentation During Normal Operation Appendix C Host Access to Storage 263