We are decommissioning multiple old ESXi4.1 hosts from our environment after having migrated all the VMs off of them and on to new ESXi5.1 blade hosts.
Storage was presented to both types of hosts to allow the cold migration of the VMs, but now that we are done and want to send the old hosts to the data center in the sky, I'm wondering how to safely go about unpresenting the storage.
I've use this article in the past when removing storage from a host, but it was in a situation where no VMs were on the datastores as step one indicates here;
Best Practice: How to correctly remove a LUN from an ESX host | VMware vSphere Blog - VMware Blogs
In this case though the datastores are chock full of VMs that are running and need to stay running.
So my question is, how do I go about unpresenting the storage from these old hosts without causing issues for the VMs running on the datastores?
Thanks