Placing a Controller Offline or Online

Related Topics

Placing a controller offline makes it unavailable for I/O operations, and moves its arrays to the other controller if failover protection is enabled.

Placing a controller online will set it to optimal and place it in an active mode, available for I/O operations.

Note: The controller may be in an offline state if it failed a diagnostics check.

Caution:

How to Place a Controller Offline

Note: This option is only available when the controller is online.

1

To take a controller offline, select it in the Physical View; then, select either the Controller >> Place >> Offline pull-down menu option, or Place >> Offline from the right-mouse pop-up menu.

Result: The Confirm Place Offline dialog is displayed.

2

Select Yes.

Result: The Place Offline operation begins. The controller icon changes to Offline.

3

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.

How to Place a Controller Online

Note: This option is only available when the controller is offline.

1

Select the offline controller in the Physical View; then, select either the Controller >> Place >> Online pull-down menu option, or Place >> Online from the right-mouse pop-up menu.

Result: The Confirm Place Offline dialog is displayed.

2

Select Yes.

Result: The controller icon changes to Optimal.

3

If the Auto Logical Drive Transfer (ADT) entry is set to Enabled and you ARE running a host based, multi-path driver then No action is required. The host based, multi-path driver will automatically initiate a transfer of logical drives to their preferred controller.

Note that 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 then select the Storage Subsystem >> Redistribute Logical Drives to move the formerly owned logical drives back to this controller owner.

Related Topics

Learn About Controller Diagnostics

Running Controller Diagnostics

Learn About Failover Protection Settings