2V0-622 · Question #191
An administrator needs to recover disk space on a previously-used thin provisioned virtual disk. The volumes where the administrator needs to recover the disk blocks are on VAAI-compliant storage arra
The correct answer is B. Use VMware Converter to migrate the virtual machine to a new datastore. This will recreate the D. Execute the esxcli storage vmfs unmap command.. Reclaiming unused thin-provisioned disk space on VAAI-compliant arrays requires either issuing SCSI UNMAP commands via esxcli or recreating the VMDK entirely through a migration tool.
Question
An administrator needs to recover disk space on a previously-used thin provisioned virtual disk. The volumes where the administrator needs to recover the disk blocks are on VAAI-compliant storage arrays. Which two actions should the administrator take accomplish this task? (Choose two.)
Options
- APerform a Storage vMotion to another volume in order to force free space recovery to occur.
- BUse VMware Converter to migrate the virtual machine to a new datastore. This will recreate the
- CIssue the vmkfstools -vmfs unmap command within the VMFS volume directory on the ESXi host
- DExecute the esxcli storage vmfs unmap command.
How the community answered
(51 responses)- A8% (4)
- B80% (41)
- C12% (6)
Why each option
Reclaiming unused thin-provisioned disk space on VAAI-compliant arrays requires either issuing SCSI UNMAP commands via esxcli or recreating the VMDK entirely through a migration tool.
Storage vMotion migrates the VM to another volume but does not issue UNMAP commands to the source VAAI-compliant array, so it does not reclaim thin-provisioned blocks on the original datastore.
Using VMware Converter to migrate the VM to a new datastore recreates the VMDK from scratch, allocating only the blocks that contain actual data and thereby recovering all previously wasted thin-provisioned space.
vmkfstools -vmfs unmap is not a valid vmkfstools subcommand syntax; the correct CLI tool for issuing VMFS UNMAP operations is esxcli storage vmfs unmap.
The esxcli storage vmfs unmap command leverages the VAAI UNMAP SCSI primitive to notify VAAI-compliant arrays that previously allocated blocks are no longer in use, instructing the array to reclaim that physical storage capacity.
Concept tested: VAAI UNMAP thin-provisioned space reclamation on VMFS
Source: https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.storage.doc/GUID-71470D72-7B25-4D22-A2AE-B9D5A0D3CC7A.html
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