When you unmount a datastore in the VMware Host Client, it remains intact, but you can no longer view it in the inventory of the host that you manage. The datastore continues to appear on other hosts that it remains mounted on.

Do not perform any configuration operations that might result in I/O to the datastore while the unmount is in progress.


Note: Make sure that the datastore is not used by vSphere HA heartbeating. vSphere HA heartbeating does not prevent you from unmouting the datastore. However, if the datastore is used for heartbeating, unmounting it might cause the host to fail and restart all active virtual machines.
Before unmounting a datastore, also make sure that the following prerequisites are met:
  • No virtual machines reside on the datastore.
  • The datastore is not managed by Storage DRS.
  • Storage I/O control is disabled for this datastore.


  1. Click Storage in the VMware Host Client inventory and click Datastores.
  2. Right-click the datastore to unmount from the list and click Unmount.
  3. Confirm that you want to unmount the datastore.