Placing a offline makes it unavailable for I/O operations and moves its to the other controller if failover protection is enabled.
Placing a controller online sets it to status and places it in an , available for I/O operations.
Note:
The controller might be in an Offline state if it failed a diagnostics check.
Important:
Use this option only under the guidance of a representative.
Placing a Controller Offline
Attention:
Possible loss of data access – When you place a controller offline, you might not be able to access your data. Use this option only under the guidance
of a representative.
Keep these guidelines in mind when you place a controller offline:
Place a controller offline only when instructed to do so by the Recovery Guru.
If you do not use , data in the cache of the controller that you place offline is lost.
If you take a controller offline and you have controller failover protection through a , the other controller in the pair takes over. Arrays and their associated that were assigned to the offline controller are automatically reassigned to the remaining controller. If you do not have
a multi-path driver installed on the application host and you take a controller offline while the application is using the
associated logical drives, application errors occur.
If you do not have a multi-path driver installed on the application host, make the appropriate host operating system modifications
so that the applications can recognize the new I/O path.
Note:
This option is only available when the controller is online.
Placing a Controller Online
If the entry is set to Enabled and you are running a host-based, multi-path driver, no action is required. The host-based, multi-path driver automatically
initiates a transfer of logical drives to their preferred controller.
Note:
Detection of a restored preferred path by the multi-path driver can take up to 10 minutes.
If the Auto Logical Drive Transfer (ADT) entry is set to Disabled or you are not running a host-based, multi-path driver, select Advanced >> Redistribute Logical Drives to move the formerly ownedlogical drives back to this .
Note:
This option is only available when the controller is offline.
To perform the specified task, go to the indicated step: