Drives can sometimes display small problems that do not interfere with normal operation, but which could be a sign that the drive might fail sometime soon. The maintenance center provides a way to put these drives under increased scrutiny.
When a suspect drive is in the maintenance center, it is subjected to a number of tests. If the drive passes all of the tests, Data ONTAP redesignates it as a spare; if it fails any tests, Data ONTAP fails the drive.
By default, Data ONTAP puts a suspect drive into the maintenance center automatically only if there are two or more spares available for that drive. If that drive is housed in a shelf that supports automatic power-cycling, power to that drive might be turned off for a short time. If the drive returns to a ready state after the power-cycle, the maintenance center tests the drive. Otherwise, the maintenance center fails the drive immediately.
You can put a suspect drive into the maintenance center manually regardless of how many spares are available. You can also specify the number of times a drive is allowed to go to the maintenance center and whether it should go immediately or only after copying its contents to a spare drive.
The default value is on.
The default value is 1, which means that if the drive is sent to the maintenance center more than once, it is automatically failed.
If the target drive is in use, the default is that it does not enter the maintenance center until its contents have been copied to a spare drive. You can put the drive into the maintenance center immediately by including the -i option.