Esxcli Storage Vmfs Unmap 6 7

This is very handy for thin provisioned storage.

Esxcli storage vmfs unmap 6 7. Vmfs6 supports the block size of 1 mb. On esxi 6 7 vmfs 6. On vmfs6 datastores esxisupports the automatic asynchronous reclamation of free space. This is a great feature and very handy for those of you using thin provisioning on your datastores hosted on storage that supports vaai.

You can compare this function with trim command on windows. The next thing is is your host s enabled to participate in automatic unmap. Read about how we use cookies and how you can control them here if you continue to use this site you consent to our use of cookies. My understanding is that vmfs finds datastores by scanning all the disks by looking in the partition table for partitions of type vmfs and then looking for metadata in these partitions.

In the updated versions of vmware vsphere namely versions 6 5 and 6 7 a long forgotten feature called unmap appeared which returns the virtual machine disk space to the disk array using vaai. If you run the command against a datastore that does not support the unmap functionality such as das volumes you will see the following error. Storage sectors of the size smaller than 1 mb are not reclaimed. With vsphere 6 0 to schedule a cron job you edit the cron job found at the.

The first extent is supposed. Unmap granularity equals the block size which is 1 mb. We use cookies for advertising social media and analytics purposes. To use automatic space reclamation you need to have a vmfs6 datastore which is available only with vsphere 6 5.

Specify granularity for the unmap operation. When running vsphere 6 5 or 6 7 and utilizing a vmfs 6 datastore we now have access to automatic lun reclaim this unmaps unused blocks on your lun which automatically unmaps unused storage on your luns. Devices backing volume do not support unmap. The command esxcli storage vmfs snapshot list is showing me a datastore that i cannot find in any vmfs partition.

With vsphere 6 5 came vmfs 6 and with vmfs 6 came the auto unmap feature. They will issue it to the dead space and dead space only. Asynchronous unmap processing has several advantages. The block size on a vmfs datastore defines the maximum file size and the amount of space the file occupies.

I recently wrote a post on automatic space reclamation vmfs unmap that was introduced in vsphere 6 5 and i got a lot of good response from the readers. The way automatic unmap works is that all esxi 6 5 hosts that see the vmfs 6 datastore participate in the unmap process. Esxcli storage vmfs unmap u 4532d832 4ff42822 50eg d92g77fd8d49. They have crawlers that will run unmap to the various datastores intermittently.