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© Rakhesh Sasidharan

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Script to run esxcli unmap on all datastores attached to an ESXi host

It’s a good idea to periodically run the UNMAP command on all your thin-provisioned LUNs. This allows the storage system to reclaim deleted blocks. (What is SCSI UNMAP?)

The format of the command is:

I wanted to make a script to run this on all attached datastores so here’s what I came up with:

The esxcli storage filesystem list command outputs a list of datastores attached to the system. The second column is what I am interested in, so that’s what awk takes care for me. I don’t want to target any local datastores, so I use grep to filter out  the ones I am interested in. 

Next step would be to add this to a cron job. Got to follow the instructions here, it looks like.