These are the requirements
to unmount a datastore
No virtual machine resides on the datastoreThe datastore is not part of a Datastore Cluster
The datastore is not managed by storage DRS
Storage I/O control is disabled for this datastore
The datastore is not used for vSphere HA heartbeat
No virtual machine
resides on the datastore:
An easy step is to
migrate the VMs and move the templates using Storage vMotions. That qualifies you
for the “No virtual machine resides on the datastore”
pre-requisite. VMs or Templates that have been removed from Inventory
will not block an unmount of a datastore.
The datastore is not part of a Datastore
Cluster/ The datastore is not managed by storage DRS:
If the datastore is
part of a Datastore Cluster then you can simply drag it out of the cluster to
remove it. This sorts both “The datastore is not part of a Datastore Cluster”
and “The datastore is not managed by storage DRS”
Storage I/O control is disabled for this
datastore:
Click properties to
open the properties of the datastore and you’ll see the Storage I/O Control
checkbox. Make sure it’s un-ticked and this will take care of the “Storage
I/O control is disabled for this datastore” pre-requisite.
The
datastore is not used for vSphere HA heartbeat
In the case of vSphere
HA it will depend on your clusters’ settings (vSphere HA > Datastore
Heartbeating) . you can manually select datastores using “Select only my
preferred datastores”. This qualifies for “The datastore is not used for
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Unmounting the Datastore
Once the datastore is
fully evacuated, browse to “Datastores and Datastore Clusters”, right click the
datastore and select Unmount
Detaching the unmounted datastores
This is a manual
process. Select each host and detach the storage device that backs the
datastore (select the host > Configuration > Storage > Devices >
Select device and right click > Detach).
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