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Re: [zfs-discuss] Comstar thin provisioning space reclamation

Subject: Re: [zfs-discuss] Comstar thin provisioning space reclamation
From: Brent Jones
Date: Thu, 19 Nov 2009 19:59:41 -0800
On Wed, Nov 18, 2009 at 4:09 PM, Brent Jones <brent@xxxxxxxxxxxxx> wrote:
> On Tue, Nov 17, 2009 at 10:32 AM, Ed Plese <ed@xxxxxxxxxxx> wrote:
>> 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
> It seems the compression setting on the zvol is key here. Tried
> without compression turned on, and the thin provisioned file grew to
> its maximum size.
> I'm re-running it on the same volume, this time with compression
> turned on to see how it behaves next  :)
> --
> Brent Jones
> brent@xxxxxxxxxxxxx

Turning compression on was the key. Reclaimed about 5TB of space
running sdelete (though it takes a very long time)

Brent Jones
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