The following is a quick tutorial on removing a VMFS datastore from an ESXi host
1) Do the pre-requsite checks
– The datastore is not part of the Datastore Monitoring (HA).
– SIOC is disabled on the datastore.
– The datastore is not part of a SDRS cluster OR part of a datastore cluster.
– No Virtual Machines/Snapshots/Templates are present on the datastore.
Note: ESXi 5.x will do a verification check of all these before you are able to unmount anyway.
2) Umount Datastore
Select ESXi Host -> Configuation. In the Datastores right click the datastore and select Unmount (You can go to Home -> Inventory -> Datastores and Datastore Clusters and unmount the datastore from all hosts but in this case (measure twice, cut once!) I have done each host individually. The datastore should appear greyed out now.
Note: Before unmounting get the NAA ID of LUN select the properties of the datastore.
3) Detach LUN
When we have the NAA ID select devices & and locate the corresponding identifier. Right click the device and then select Detach.
The device should be greyed out now.
Note: Esxi 5.x does the check for you again.
4) Remove LUN from Equallogic
I normally like to just take the LUN offline for a period of time just to be sure!
Log into the Equallogic Group Manager -> Select the Volumes section -> Highlight the LUN (internal-lun1 in my case) and click Set Offline. I will destroy this at a later date.
6) Permanently remove the the LUN from the ESXi hosts.
Log into the host(s) via SSH
List the detached devices
# esxcli storage core device detached list
Remove the device permanently
# esxcli storage core device detached remove naa.xxxxxxxxxxxxxxxxxxxxxxxxx75
For full ESXi removal instructions view: KB2004065