Grass Valley Network Attached Storage System Serial ATA Network User Guide v.1.0.04 - Manual (Page 166)

Replacing a RAID Controller
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Replacing a RAID Controller
Make sure that the replacement RAID controller has the same firmware
revision level as the controller that is running.
In the menu pane, choose Storage | RAID System | Logical/Physical view .
Once you determine which controller has failed, make note of its position.
Power down the appliance for this procedure; NewsShare NAS software will
not be available during the replacement.
>>> The RAID controller cannot be replaced while NewsShare NAS is powered
up and running. To replace a RAID controller, power down the system.
Power down the NewsShare NAS. This means both nodes and the storage
subsystem. Remove the fibre channel cable from the storage controller. (Once
a controller has failed, the node that it is connected to will fail as well; the
system can no longer see the storage device and needs to do a failover.)
To remove the canister, do the following:
1. Unlatch the two ejector levers on the back of the canister. Loosen the captive
screws, as shown in Step 1.