Accusys ExaSAN A12S2-PS - Manual (Page 100)

4. How to Use
User Guide Page 4-49
4.1.2.8.7 Unlock Drives
The RAID controller may lock abnormal drives in an array. You may unlock these drives
and rejoin them in an array. Drives may be locked under one of two conditions:
1. If a drive returns data too slowly, the controller determines the drive is experiencing
a fault and executes Drive Drop. When you unlock the drive, it will be added directly
to the array if there has not been drive access during the locked period. Otherwise,
the controller will rebuild parity data on the drive when the drive is online.
Note
If “Drive Drop" occurs, it is recommended to use S.M.A.R.T. to
check the drive condition and replace it if necessary.
2. When replacing a damaged drive with a new one, the newly added drive might be
locked. Click Unlock to allow the array to rebuild the drive. You can check the
rebuild progress in the Main view.
Note
The time required for on-the-fly initialization, drive building, online
expansion and migration may vary according to the capacity of
the drive and the array.