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df on filer shows larger amount of used space for volume than Windows host

I have a flex volume with the following options:

Volume State           Status            Options
BOSEQUCO01_Vol_2 online          raid_dp, flex     create_ucode=on,
                                redirect          convert_ucode=on,
                                active_redirect   fractional_reserve=0,
                                                  snapshot_clone_dependency=on

It has 1200GB total, 453GB used according to a "df -g" run on the filer.  This volume is exported as a LUN to a standalone Windows 2008 server and when I get properties on the drive, I see that it's only using 381GB.  What's going on with the 72GB that the server doesn't see?  Is this common behavior for LUNs?  I had this same behavior the other day and ran a SnapDrive Space Reclaimer job and it was able to eliminate the "ghost" space.  However, now when I run the reclaimer it says that there is no space to reclaim.

Thanks,

Paul

Re: df on filer shows larger amount of used space for volume than Windows host

Most likely if this isn't a whitespace issue...it is a snapshot issue.  What does a df -g show is the reserve over, and what are your LUN settings?  Is the LUN guaranteed, thin provisioned?  lun show -v should help get most of that.

- Scott