Our clients often aren't able to accurately size their Windows servers. It is common for us to be asked to extend a Windows volume. They have allocated all of the disk in the disk group as well as many of the existing datastores. In some cases, if I were to get a request to increase a volume, I would have to use an extent to be able to have the additional space in the Datastore to extend the VMDK.
Of course it would be possible to cold migrate to a new larger new larger datastore to accomadate the same thing but, in some cases they have 1TB or more that needs to be increased and that amount of space isn't available or downtime is difficult to get.
I'll look into Storage Vmotion. It may help to avoid delay using extents. Even if there were no technical reasons to avoid extents, they add unecessary complexity for our environment. It's nice to know that one EVA Virtual Disk represents one Datastore.
Anyone know if you can use Storage VMotion to move only one virtual disk as opposed to the entire VM. For instance, I have a Windows 2003 VM with a C: VMDK and a 😧 VMDK. I want to only move D:.
