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Disk Failure or RemovalMoving a subdisk for redundant volumes (mirrored or RAID-5) will use the redundant data to recreate the subdisk on the healthy disk. However, for nonredundant volumes (concatenated or striped), the data cannot be recreated and doing subdisk move will therefore lose data, which could be recovered if the disk can be repaired. Thus, when you attempt to move a subdisk from a failed or missing disk that has nonredundant data, a dialog box comes up that asks you if you want to force the move. You may want to force the move if you don't need the data anymore or you can no longer recover the data. By doing so, you will retain the volume structure but there is no guarantee that the data will be recoverable. Use the Moving a Subdisk feature to move the part of a volume that is on a failed or missing disk to a healthy one. Disk PhaseoutWhen a disk starts getting intermittent I/O errors and shows signs of hardware fatigue, you can use the Moving a Subdisk feature to move all its subdisks to healthier disks. The benefit of moving subdisks instead of copying the volumes is that you need only enough space on the receiving disks for the subdisks on the one failed disk, not for entire volumes that may span multiple disks. Another advantage is that there is no interruption in I/O. Moving subdisks provides you a flexible means of making adjustments in your storage system while it is up and running. |
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