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When performing an Entire VM Restore or Virtual Disk Restore using Direct SAN Restore, the performance may be sub-optimal when the restored Disk Type Setting is set to Thick (lazy zeroed).
When using Direct SAN to restore a disk with its disk type set to Thick (lazy zeroed), overall restore performance can be affected because of repeated disk manager API calls to ClearLazyZero and AllocateBlock.
When restoring via Direct SAN, disks must be restored as Thick, either lazy zeroed or eager zeroed. Performance has been shown to be much higher when using the eager zeroed option1. Entire VM Restore On the Datastore tab of the Entire VM Restore wizard, use the Disk Type button in the bottom-right corner to set the restored disk type to "Thick (eager zeroed)."
Alternative: Use Network or Virtual Appliance Transport Mode If you'd prefer to restore the disk as Thick (lazy zeroed), performance can be improved by using the "Pick proxy to use" option in the Entire VM Restore and Virtual Disk Restore wizards to select either a proxy that does not have Direct SAN capability or a proxy that has been manually configured to use either Virtual Appliance or Network transport mode. Additionally, simply selecting the disk type Thin will force the restore to use any other transport mode because Direct SAN cannot restore disks as Thin provisioned.
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