unable to delete a datastore

Hi !

a datastore was nearly full, so i decide to increase it. The datastore was used by a partition 's VM

Here how i proceed :

1 - I put the datastore offline

2 - I umount the datastore from vcenter

3 - i try to delete it, but impossible; the message was it is still used. It was used by the VM

4 - so i try to migrate all the VM to an other datastore, but impossible the process failled and the VM stop.

5 - i decide to delete the partition from the VM and boot

6 - the VM is up and ok

When il look the VM tab from the datastore , i could still see the VM while the datastore is ofline and the partition deleted

i don't now how to break the link so the VM will not point to the datastore.

i notice that there is a snapshot on this VM. it mean that i delete the partition while a snapshot was present; could be the source of the problem ?

Now i hesitate to consolide the VM, i m afraid that the consolidation fail.

Thanks for helps !