APC RAID Subsystem SCSI-SATA II Technical Information Page 131

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Advanced Functions
5-13
• Failback State Update
When the backup controller’s firmware version is different with the survival controller, the survival controller will
automatically synchronize the firmware to the backup controller to make the two controllers with the same firmware
version. The user needs to confirm the firmware update by pressing the button on the LCD panel to continue the
automatic synchronization.
• Normal State Update
The normal state indicates that two controllers are normally in use. When the system receives a firmware update
command, it first updates the primary flash and then the secondary flash on both controllers. After that, the system will
execute non-interruptible firmware update to make the redundant-controller system always remains online.
For example, once the firmware update is executed on controller A, all the LUN mappings will be shifted from controller
B to controller A. Then the controller B restarts automatically. When the controller B is completed with the firmware
update, all the LUN mappings will be shifted from controller A to controller B. The controller A then restarts
automatically.
• Degraded State Update
When the system is operating in a degraded state, users simply perform the firmware update on a single controller.
However, when the failed controller is replaced, the system will automatically synchronize the firmware to the
replacement controller.
5.3.3 Redundant-Controller System Configuration with MPIO
Active-Active Redundant Single MPIO Host (Dual Channel)
As Figure 5-6 shows, the redundant RAID system is operating in a single MPIO host environment using the symmetric
storage provisioning method. The access channel is established via two fibre ports, fcpa1and fcpb1. The redundant paths
of two LUNs are also established by mapping them across two fibre ports.
To set up the connection, perform these tasks in the RAID GUI:
• Create DG0LD0 with preferred controller A; create DG1LD0 with preferred controller B
• Specify the storage provisioning method
• Assign the WWPN for the HBAs in the server hosts, and group them into a host group
• Bind the two logical disks to the host group
Figure 5-6 Redundant Single MPIO host (dual channel)
FCP1FCP2FCPa2 FCPa1 FCP1FCP2FCPb2 FCPb1
DG0LD0
DG1LD0
Host Group 0
WWPN
WWPN
HBA1HBA0
Host
Controller BController A
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