Understanding copy back mode

Copy back is a method of restoring a logical device's original configuration after replacing a failed drive in a pool. It allows you to restore the data to its prior location, before the logical device was rebuilt from its spare.

When copy back is enabled, it starts automatically when the controller detects that a failed drive is replaced. The Adaptec Storage Manager displays a progress indicator in the status bar while the operation is in progress. You cannot perform any other actions on the controller until the copy back is complete.

Copy back is disabled by default. To enable copy back, choose Enable copy back mode from the controller object Action menu.

An example

A RAID Level-5 logical device consists of three physical drives and a spare. When a drive in the pool fails, the spare drive is used to rebuild the logical device. When you replace the failed drive, copy back moves the data from the former spare to the newly replaced drive. Then, the former spare resumes its original role as the spare drive.

More information


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