vSphere 5: VAAI Thin Provisioning Block Reclaim/UNMAP Issue
In the view of the new feature in vSphere 5 on VAAI, the reclaim of space from thin provision datastore whereby a file is deleted from datastore or when a storage vmotion is performed or even a snapshot consolidation. Performance issue may arise and create error when the above are performed. Details can be found in this blog: http://blogs.vmware.com/vsphere/2011/09/vaai-thin-provisioning-block-reclaimunmap-issue.html Knowledge base: http://kb.vmware.com/kb/2007427