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Dell PowerVault MD 34XX/38XX Series Storage Arrays CLI Guide

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Defragmenting A Disk Group

When you defragment a disk group, you consolidate the free capacity in the disk group into one contiguous area. Defragmentation does not change the way in which the data is stored on the virtual disks. As an example, consider a disk group with five virtual disks. If you delete virtual disks 1 and 3, your disk group is configured in the following manner:

space, virtual disk 2, space, virtual disk 4, virtual disk 5, original unused space

When you defragment this group, the space (free capacity) is consolidated into one contiguous location after the virtual disks. After being defragmented, the disk group is:

virtual disk 2, virtual disk 4, virtual disk 5, consolidated unused space

To defragment a disk group, run the following command: 
start diskGroup [diskGroupNumber] defragment
where, diskGroupNumber is the identifier for the disk group.
  • NOTE: Defragmenting a disk group starts a long-running operation.

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