Each controller module
contains a Management Controller processor and a Storage Controller processor.
When necessary, User can restart or shut down these processors for one
controller or both controllers.
Restarting controllers
Perform a restart when the
SMU informs user that user has changed a configuration setting that requires a
restart or when the controller is not working properly.
When user restart a
Management Controller, communication with it is lost until it successfully
restarts. If the restart fails, the Management Controller in the partner
controller module remains active with full ownership of operations and
configuration information.
When user restart a Storage
Controller, it attempts to shut down with a proper failover sequence. This
sequence includes stopping all I/O operations and flushing the write cache to
disk. At the end, the controller restarts. Restarting a Storage Controller
restarts the corresponding Management Controller.
CAUTION: If user restart both controller modules, all users
will lose access to the system and its data until the restart is complete.
NOTE: When a Storage Controller is restarted, current performance
statistics that it recorded are reset to zero, but historical performance
statistics are not affected. In a dual-controller system, disk statistics may
be reduced but are not reset to zero, because disk statistics are shared
between the two controllers.
To perform a restart
1. Perform
one of the following:
·
In the banner, click the system panel and select Restart
System.
·
In the System topic, select Action > Restart System.
The Controller Restart and
Shut Down panel opens.
2.
3.
4. Select
the Restart operation
5. Select
the controller type to restart: Management or Storage.
6. Select
the controller module to restart: Controller A, Controller B, or
both.
7. Click OK.
A confirmation panel appears.
8. Click OK to
continue. Otherwise, click Cancel. If user clicked OK,
a message describes restart activity
Shutting down controllers
Perform a shut down before
user remove a controller module from an enclosure, or before user power off its
enclosure for maintenance, repair, or a move. Shutting down the Storage
Controller in a controller module ensures that a proper failover sequence is
used, which includes stopping all I/O operations and writing any data in write
cache to disk. If user shut down the Storage Controller in both controller
modules, hosts cannot access system data and the SMU will be unavailable.
CAUTION: User can continue to use the CLI when either or
both Storage Controllers are shut down, but some information might not be
available.
To perform a shut down:
1. . Perform
one of the following:
·
In the banner, click the system panel and select Restart
System.
·
In the System topic, select Action > Restart System.
The
Controller Restart and Shut Down panel opens.
2. Select
the Shut Down operation, which automatically selects the
Storage controller type.
3. Select
the controller module to shut down: Controller A, Controller B, or
both
4. Click OK.
A confirmation panel appears.
5. Click OK to
continue. Otherwise, click Cancel. If user clicked OK, a message
describes shutdown activity.
