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 Post subject: Re: 3PAR VV for datastores Vmware
PostPosted: Wed Feb 13, 2019 2:07 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 814
Location: Europe
Richard Siemers wrote:
Also ESX 6.5 and VMFS6 support the automatic unmap of deleted data. ESX 6.5 and VMFS5 do not. Remember to check your datastore VMFS versions.


Just be aware that last time I checked, this required the VMDK to be "thin".

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 Post subject: Re: 3PAR VV for datastores Vmware
PostPosted: Wed Feb 13, 2019 10:46 am 
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Joined: Tue Aug 18, 2009 10:35 pm
Posts: 1211
Location: Dallas, Texas
MammaGutt wrote:
Just be aware that last time I checked, this required the VMDK to be "thin".


That is 100% correct for in-guest unmap on a VMFS datastore, to pass trim/unmap commands from a guest-os/filesystem to VMFS6, and then onto the LUN. I just read that VMware is also converting guest ata TRIM commands into scsi UNMAP commands.

Vmware VVOLs, and RDMs in-guest unmap talks directly to the LUN. Note: linux unmap support needs virtual hardware version 11 or higher.

Deleting or moving VMDKs will auto unmap using VMFS6 regardless if the vmdk was thick or thin.

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