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Sun StorEdge T3 Disk Tray Installation, Operation, and Service Manual • July 2000
5.2.5
Controller Card
The controller card is redundant only when the disk tray is configured in a partner
group; that is, interconnected with another disk tray that contains a controller card.
In a partner-group configuration, if there is a controller card failure in a master unit,
the controller would failover to the alternate master, which would then assume
master controller status. After the failed controller card is replaced in the master
unit, that unit assumes the role of alternate master. The new master unit (previously
the alternate master) retains all the necessary information, such as the unit IP
address, to continue functioning without system interruption. The partner group can
be returned back to its original, prefailover configuration of master and alternate
master by performing a
reset
command.
In a single controller unit configuration, system activity is interrupted until the
controller card is replaced and is back online. When a controller card is replaced, the
disk tray automatically downloads the previous settings to the new controller card.
The disk tray is fully functional once the new controller card is installed and the
controller is online.
5.2.5.1
Controller Card LEDs
The controller card has a channel-active LED for the host interface port, a controller
status (online) LED, and a reset switch. For the locations of and information about
the LEDs and how to interpret them to diagnose a failure, see Section 4.1.4.4
“Controller Card LEDs” on page 4-8.
Note –
Even if the LED indicates a controller card failure, you should always verify
the FRU status using either the CLI or Component Manager before replacing the
unit. Refer to the Sun StorEdge T3 Disk Tray Administrator’s Guide or Sun StorEdge
Component Manager User’s Guide for more information.
5.2.5.2
Removing and Replacing a Controller Card
A controller card can be replaced without system interruption only if the disk tray is
part of a partner group (redundant controller unit configuration).
To replace the controller card:
1. Observe static electricity precautions.
2. Ensure that the controller card is showing failure status.
3. Remove the Ethernet cable from the 10BASE-T connector.
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