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Unable to grow or expand a VMFS volume or datastore (1017662)

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  • When you try to grow or expand a VMFS volume by clicking Increase option, there are no available devices to select.
  • When you select the volume and click Next, you see the error:

    failed to update disk partition information

  • When you click Increase, a device is listed but does not have Expandable = Yes.


To increase the capacity (grow or extend) of a VMFS datastore successfully, rescan the storage adapters to ensure that Extent Device list contains updated list and then use the Increase option. 


To increase the capacity of a VMFS datastore:

  1. Open vCenter session to the Datacenter/Cluster.
  2. Select the Hosts and Clusters view and click the Rescan All link.
  3. Switch to the Datastores and Datastore Clusters view.
  4. Select each volume you wish to increase and select the Properties link.
  5. Ensure the Extent shows in the Extents window, and reflects the current free space reported by the storage array.
  6. Click the Increase button and select the extent to resize, then click Next.
  7. Ensure the Total Capacity reflects the new capacity.
Alternatively, you may directly connect to ESXi host and perform a rescan.
For more information, see Storage Refresh and Rescan Operations.

If a shared datastore powers on virtual machines and becomes 100% full, use one of these workarounds:
  • Increase the database capacity only from the host on which the powered on virtual machines are registered.
  • Free up additional storage space by performing a Storage vMotion to migrate some of the virtual machines or a datastore with more available space.


increase-datastore, increase-size, expand vmfs, failed to update disk

See Also

Update History

07/13/2011 - Added note about increasing the size of storage arrays. 04/08/2013 - Added vCenter Server 5.1.x and ESXi 5.1.x to Products 04/24/2-13 - Added alternative workaround in the Additional Information section

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