VMware: Thin disk VMs with Snapshot Restored as Thick

SUMMARY

When restoring a thin-disk VM that had a snapshot at time of backup, the restored VM disks are created as thick

ISSUE

When restoring a thin-disk VM that had a snapshot at time of backup, the restored VM disks are created as thick on vSphere 4.x. This is a known issue with VMware version 4.x:

When a virtual machine with thin disk has a snapshot, the redo log is incorrectly created as thick disk

The bug was fixed in vSphere 5. For version 4.x, you can first commit or remove the snapshot before taking the backup.

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