I have a LUN that is presented to ESXi v4.1 as a datastore. Every few days it runs completely out of space. I free'ed up 28 GBs but I have a feeling it's going to happen again. What could be causing this? I have an old backup job running the older backup API but I have it set to use an external drive at the guest OS level when running the backup jobs.. And.. I think it was already done.. I'll have to check the logs. What else could be eating up the space? Did I over-provision the drives maybe?