HP Cisco MDS 9124 Cisco MDS 9000 Family Fabric Manager Configuration Guide - R - Page 1120

iSCSI High Availability Chapter 50 Configuring iSCSI Send documentation comments to [email protected] IP storage has two additional features that provide an HA solution in this scenario. • IPS ports support the VRRP feature (see the "Configuring VRRP for Gigabit Ethernet Interfaces" section on page 52-9) to provide failover for IPS ports. • IPS has transparent Fibre Channel target failover for iSCSI static virtual targets. Statically imported iSCSI targets have an additional option to provide a secondary pWWN for the Fibre Channel target. This can be used when the physical Fibre Channel target is configured to have an LU visible across redundant ports. When the active port fails, the secondary port becomes active and the iSCSI session switches to use the new active port (see Figure 50-37). Figure 50-37 Static Target Importing Through Two Fibre Channel Ports iSCSI host iSCSI IP Network Switch 1 Fibre Channel storage pWWN 1 FC pWWN 2 26:00:01:02:03:04:05:06 26:00:01:02:03:10:11:12 Fibre Channel storage Primary access = pWWN1 Secondary access = pWWN 2 ABC 91568 In Figure 50-37, you can create an iSCSI virtual target that is mapped to both pWWN1 and pWWN2 to provide redundant access to the Fibre Channel targets. The failover to a secondary port is done transparently by the IPS port without impacting the iSCSI session from the host. All outstanding I/Os are terminated with a check condition status when the primary port fails. New I/Os received during the failover are not completed and receive a busy status. Tip If you use LUN mapping, you can define a different secondary Fibre Channel LUN if the LU number is different. Enable the optional revert-primary-port option to direct the IPS port to switch back to the primary port when the primary port is up again. If this option is disabled (default) and the primary port is up again after a switchover, the old sessions will remain with the secondary port and do not switch back to the primary port. However, any new session will use the primary port. This is the only situation when both the primary and secondary ports are used at the same time. To create a static iSCSI virtual target for the entire Fibre Channel target port using Device Manager, follow these steps: Step 1 Step 2 Step 3 Step 4 Step 5 Click IP > iSCSI. You see the iSCSI configuration (see Figure 50-10). Click the Targets tab to display a list of existing iSCSI targets shown (see Figure 50-11). Click Create to create an iSCSI target. You see the Create iSCSI Targets dialog box (see Figure 50-13). Set the iSCSI target node name in the iSCSI Name field, in IQN format. Set the Port WWN field for the Fibre Channel target port you are mapping. 50-52 Cisco MDS 9000 Family Fabric Manager Configuration Guide OL-17256-03, Cisco MDS NX-OS Release 4.x