How to convert thin disk to thick disk (Inflate) without VM shutdown?
(disk too big, and i cannot shutdown vm for so long time)
You can storage vmotion to another datastore and select thick provisioning.
Keep in mind that it will affect VM performance while the vMotion / inflate process lasts.
Also, that the other datastore should have enough free space to allocate the thick disk.
Check this KB:
you can try this using powerCli
Move-VM $VM -Datastore $destDS -DiskStorageFormat $disktype
Just replace the following items
I'm not completely sure if it will work if you use the same source and destination datastore but it's worth a shot.
I assume you don't have vCenter, is that correct?