![]() Deleting data usually only removes the entries from the file allocation table but does not zero the blocks. Reclaiming disk space only works when the blocks on your virtual disk are really empty. ![]() ![]() The device displays Delete Status as supported meaning that it is capable of sending SCSI UNMAP commands to the array when a space reclaim operation is requested. In particular we are interested in knowing whether the array supports the UNMAP primitive for dead space reclamation (what we refer to as the Delete Status).Īnother esxcli command is used for this step: esxcli storage core device vaai status get -d Now we can run a command to display the VAAI primitives supported by the array for that device. Here we see that the device is indeed Thin Provisioned and supports VAAI. Step 1: Run below command to check information such as firmware revision, thin provisioning status, the VAAI filter and status for the datastore virtual machine is running: esxcli storage core device list –d naa.60a98000572d54724a346a6170627a52ĭisplay Name: Hitachi Fibre Channel Disk (naa.60a98000572d54724a346a6170627a52)ĭevfs Path: /vmfs/devices/disks/naa.60a98000572d54724a346a6170627a52 The only downside is that you have to power off the affected machines. Luckily, there are some tools to allow you to reclaim unused space from your virtual thin disks. ![]() Currently, VMware does not have automatic space reclamation. When you have some VMs with thin provisioned disks, you may have noticed that these will continue to grow, and never shrink, even after cleaning out data from within the VM.
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