VAAI Unmap

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xawen
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VAAI Unmap

Postby xawen » Sun Dec 04, 2016 1:58 am

Has anyone had any luck getting anything requiring VAAI Unmap working?

I'm trying to shrink thin provisioned VMDK files with free space on a datastore that has VAAI support and it's not working. I'm starting to suspect that VAAI Unmap isn't implemented or working.

Array: DS1515+
VMware: ESXi 6.5 Enterprise Plus - VCSA 6.5 Standard
Datastore: File based iSCSI volume - ESXi shows hardware support and thin provisioning available
VMware shows all VAAI primitives supported, including Delete Status (esxcli storage core device vaai status get)
VMs: Windows 2012 R2, Windows 2016 and CentOS 7 - all with thin vmdks

I have tried creating and deleting files, using sdelete to zero out all the free space and using Optimize Drives on a Windows VM (http://www.codyhosterman.com/2015/04/direct-guest-os-unmap-in-vsphere-6-0/). None of that has worked. I was able to shrink the vmdk using vmkfstools --punchzero, but that's the non-VAAI method and requires the VM to be offline.

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