Accusys ExaRAID GUI - Manual (Page 195)

Advanced Functions
5-22
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
Figure 5-6 Redundant Single MPIO host (dual channel)
FCP1 FCP2 FCPa2 FCPa1 FCP1 FCP2 FCPb2 FCPb1
DG0LD0 DG1LD0
Host Group 0
WWPN
WWPN
HBA1 HBA0
Host
Controller B Controller A