You can reclaim this space with the SDelete utility from Microsoft.
With the -c option it will zero any free space on the volume.  For
example:

C:\>sdelete -c C:

I've tested this with xVM and with compression enabled for the zvol,
but it worked very well.


Ed Plese


On Tue, Nov 17, 2009 at 12:13 PM, Brent Jones <br...@servuhome.net> wrote:
> I use several file-backed thin provisioned iSCSI volumes presented over 
> Comstar.
> The initiators are Windows 2003/2008 systems with the MS MPIO initiator.
>
> The Windows systems only claim to be using about 4TB of space, but the
> ZFS volume says 7.12TB is used.
> Granted, I imagine ZFS allocates the blocks as soon as Windows needs
> space, and Windows will eventually not need that space again.
> Is there a way to reclaim un-used space on a thin provisioned iSCSI target?
>
>
>
> --
> Brent Jones
> br...@servuhome.net
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss@opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>
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