StorCase Technology CSI-to-SCSI Single & Dual RAID - Manual (Page 107)

94 Configuration
StorCase Technology, Inc. Dual RAID Module User's Guide - Rev. A03
Understanding the Active-Active Configuration
Controller A - The primary controller. The controller's identity is displayed continuously
at the bottom of the Disk Array Administrator screen.
Controller B - The secondary controller. The controller's identity is displayed continu-
ously at the bottom of the Disk Array Administrator screen.
Failback - The act of returning ownership of controller resources from a surviving
controller to a previously failed (but now active) controller. The resources
include disk arrays, cache data, and host ID information.
Failover - The act of temporarily transferring ownership of controller resources
from a failed controller to a surviving controller. The resources include
disk arrays, cache data, and host ID information.
Kill - One controller can kill the other controller by resetting it and taking it offline.
Other - The opposite controller from the one currently being used.
Ownership - In an Active-Active configuration, a single controller has ownership of the
following resources: arrays and dedicated spares. When a controller
fails, the other controller assumes temporary ownership of its resources.
Unkill - When a surviving controller removes the reset from the other controller,
it unkills it. The other controller will reboot and attempt to come online.
In order to run the two controller modules in Active-Active mode:
- The two controllers must be installed in a proper configuration.
- Both controllers must be loaded with compatible firmware levels. The system auto-
matically detects firmware incompatibilities and will halt the boot of the second
controller.
- The operating mode of each controller must be set to Active-Active.
- Host channel 0 of each controller must be set to a different ID only if using a single
host interface. If using two host connections, then each controller's host channel can
have the same ID.