I am on vSphere 5.5. Recently I used Storage vMotion to move several datastores from one LUN to another. My process was - I created a LUN on the storage, created a temp datastore on the LUN, SvMotion'ed several VMs to the temporarry datastore, deleted the original LUN and datastore, re-created the LUN and datastore, then SvMotion'ed the VMs back to the original storage (basically a temporary swap so I could re-size datastores smaller). Somewhere during the process, I noticed that I now have folders with the name ".sdd.sf" on the root of every datastore that I used SvMotion on. On datastores that I did not do anything with, there is no such folder. The folder is visible in the datastore browser. I see from some research that ESXi has system files with the name .sdd.sf, but I see nothing about folders, and I am not sure why they showed up after a SvMotion. Anyone else seen this? Can I delete these folders?
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