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Do you have any clones or created any vms from templates? I think the newer version is doing reflinks as follows:
Thanks for responding mate, I do have vms created from templates however I don't think it's reflinks as we are creating Non-Sparse vms and even if it is then I would expect to see same usage information from df and via the OVM manager GUI.
My theory so far points towards the space required for the filesystem metadata etc for OFCS2, df shows usage including that and OVM manager shows usage minus the space taken up by the metadata, the only thing going against that is about 25 GB for metadata on a 400GB LUN doesn't look right and I ahve no way to check the basis of calculation done by OVM manager.