These operations leave blocks of unused space on the storage array. Inside the virtual machine, storage space is freed when you delete files on the thin virtual disk. ![]() You free storage space inside the VMFS datastore when you delete or migrate the VM, consolidate a snapshot, and so on. With the VMFS5 datastore, you can manually reclaim storage space. The VMFS6 datastore can send the space reclamation command automatically. The command helps thin-provisioned storage arrays to reclaim unused space from the VMFS datastore and thin virtual disks on the datastore. ![]() ESXi supports the space reclamation command, also called SCSI unmap command, that originates from a VMFS datastore or a VM guest operating system.
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