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:
Note: This option is only available when the controller is online.
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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. |
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Select Yes. Result: The Place Offline operation begins. The controller icon changes to Offline. |
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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 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) Note that detection of a restored preferred path by the multi-path driver can take up to 10 minutes. |
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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. |
Learn About Controller Diagnostics