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Troubleshooting a LUN that is extended in size past the 2TB/2047GB limit (1004230)

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  • Cannot create VMFS-3 datastore
  • vCenter Server reports the error:

    Call "HostStorageSystem.RetrieveDiskPartitionInfo" for object "storageSystem-###" on vCenter Server "" failed

  • The Add Storage wizard may not display devices or LUNs as eligible for creating a VMFS-3 datastore.
  • Attempting to create a VMFS-3 datastore may fail with the error:

    Unable to find head extent device path

  • Existing VMFS-3 datastore is unmounted and no longer mounts.
  • Guest operating system cannot access an RDM.
  • Incorrect or inconsistent device or LUN size seen.


An ESX/ESXi host is limited to a maximum LUN size of 2047GB. This applies to all LUNs being presented to an ESX Server host (VMFS and RDM). Any capacity larger than the limit is not handled. The LUN may not be presented as a choice for a data store in the Virtual Infrastructure or vSphere Client. Attempting to format the LUN from the Virtual Infrastructure or vSphere Client or command-line generates an error.

A VMFS-3 datastore on a LUN that has been extended past the limit is unmounted. All content on that data store is inaccessible.


  • Shrink the LUN back to its original size (if possible).
  • If the datastore the LUN is located on is available on any other ESX/ESXi host in the cluster then storage vMotion, clone, or move the virtual machines to an alternative datastore.
  • Destroy the LUN entirely and recreate the LUN within the limit and restore from backup.


kb create-rdm-fails  lun-presentation  cannot-create-vmfs  cannot-mount-vmfs-datastore  cannot-access-rdm esx esxi

See Also

Update History

07/12/2012 - Added additional error in Symptoms

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  • 19 Ratings