Expanding a Thick or Thin Volume

Thick and thin volumes can be expanded online, meaning that space can be added to the volume while it is still being accessed. The extra space is allocated from the volumes parent storage pool.

Volume Type

Maximum Allowed Expansion


Amount of free space in the parent storage pool.


Twenty times the amount of free space in the parent storage pool


Setting the maximum size of a thin volume to a value that is greater than the amount of free space in the storage pool is called over-allocation.

  1. Go to Main Menu > Storage & Snapshots > Storage/Snapshot.
  2. Select a thick or thin volume.
  3. Click Manage.
  4. Click Expand Volume.

    The Volume Resizing Wizard opens.

  5. Specify a new capacity for the volume.

    Capacity can be specified in megabytes (MB), gigabytes (GB) or terabytes (TB). The new capacity must be greater than the current volume capacity.

  6. Optional: Click Set to Max.

    Sets the new volume capacity to the maximum available size. This option is only available for thick volumes.

  7. Click Apply.

    The Volume Resizing Wizard closes. The volume status changes to Resizing....

After expansion is complete, the volume status changes back to Ready.