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From: Rodney Beede <mailinglist@rodneybeede.com>
To: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Shrinking virtual disk with btrfs on it
Date: Sat, 22 Jan 2011 11:27:52 -0700	[thread overview]
Message-ID: <AANLkTimaufA8PoHhaHgJDD-O+oxxrO4tzZngkSqS=0Jw@mail.gmail.com> (raw)
In-Reply-To: <20110121173419.GA5268@carfax.org.uk>

On Fri, Jan 21, 2011 at 10:34 AM, Hugo Mills <hugo-lkml@carfax.org.uk> =
wrote:
> On Fri, Jan 21, 2011 at 10:20:34AM -0700, Rodney Beede wrote:
>> Any tools to go about zeroing about the free space on a btrfs file
>> system so I can shrink the VMware vmdk virtual disk?
>>
>> I ran the VMware command, but the dynamic disk is still really big. =
=C2=A0I
>> presume it is due to free space that isn't zeroed out.
>
> =C2=A0 One solution I've used before is to write a single very large =
file
> full of zeroes, filling the filesystem, then delete it.
>
> $ dd if=3D/dev/zero of=3D/mountpoint/foo.dat && rm /mountpoint/foo.da=
t
>
> =C2=A0 Hugo.
>
> --
> =3D=3D=3D Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.=
org.uk =3D=3D=3D
> =C2=A0PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.=
org.uk
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0--- ... =C2=A0one ping(1) to rule t=
hem all, and in the ---
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 darkness bind(2) them.
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.10 (GNU/Linux)
>
> iD8DBQFNOcObIKyzvlFcI40RAodJAJ0VyXnvxNH2MxTZ08uT8WaywsA=ED=88=80=E9=BD=
=82=E4=95=BA
> 7MRCSpCsPWGiXeS73ItqnWA=3D
> =3Dngld
> -----END PGP SIGNATURE-----
>
>


I tried your method, and it made things worst.  The disk just expanded
to the maximum.  I deleted the zero filled file and made sure btrfs
compress was off.  I ran the VMware disk manage tool and told it to
defragment and shrink but it didn't get any smaller.  I think btrfs
just doesn't work that way.

I also tried btrfs filesystem defragment with no luck.
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  reply	other threads:[~2011-01-22 18:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-21 17:20 Shrinking virtual disk with btrfs on it Rodney Beede
2011-01-21 17:34 ` Hugo Mills
2011-01-22 18:27   ` Rodney Beede [this message]
2011-01-21 19:43 ` David Pottage
2011-01-22  8:28   ` Tomasz Torcz

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