From: Hugo Mills <hugo@carfax.org.uk>
To: Jan Engelhardt <jengelh@inai.de>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: btrfs fi df won't show total=
Date: Mon, 9 Jul 2012 21:25:30 +0100 [thread overview]
Message-ID: <20120709202530.GH28701@carfax.org.uk> (raw)
In-Reply-To: <alpine.LNX.2.01.1207092204450.23294@frira.zrqbmnf.qr>
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On Mon, Jul 09, 2012 at 10:06:24PM +0200, Jan Engelhardt wrote:
>
> On Monday 2012-07-09 21:25, Hugo Mills wrote:
> >On Mon, Jul 09, 2012 at 09:14:03PM +0200, Jan Engelhardt wrote:
> >>
> >> On openSUSE_12.1 with Btrfs v0.19+20120406, the following can be
> >> observed: after a change of the profiles, total=,used= is no
> >> longer shown:
> >>
> >> 20:49 mmsrv1:~ # btrfs fi df /top.srv/
> >> Data, RAID10: total=152.00GiB, used=121.07GiB
> >> System, RAID1: total=40.00MiB, used=44.00KiB
> >> System: total=4.00MiB, used=0.00
> >> Metadata, RAID1: total=112.00GiB, used=1.30GiB
> >> Metadata: total=8.00MiB, used=0.00
> >>[...]
> >> 21:10 mmsrv1:~ # btrfs fi df /top.srv/
> >> Data, RAID10: total=156.00GiB, used=124.35GiB
> >> System, RAID10: total=128.00MiB, used=48.00KiB
> >> System: total=4.00MiB, used=0.00
> >> Metadata, RAID10: total=112.00GiB, used=1.38GiB
> >
> > What's the problem here? You no longer have any RAID1 chunks, so
> >it's not showing them.
>
> Rather tha a 4-line output, I would have expected this 6-line output
> that I would also get when mkfs'ing a new fresh btrfs volume with
> raid10 from the start:
>
> Data, RAID10: total=156.00GiB, used=124.35GiB
> Data: total=foo, used=bar
> System, RAID10: total=128.00MiB, used=48.00KiB
> System: total=4.00MiB, used=0.00
> Metadata, RAID10: total=112.00GiB, used=1.38GiB
> Metadata: total=foo, used=bar
The lines without the RAID marker are there as a result of the way
that mkfs works -- it creates stub chunks which are never used, and
then upgrades to the required RAID level immediately afterwards.
The balance (any balance, not just a conversion) processes these
chunks as well as all the other chunks in the FS, and rewrites all of
the data in them (all 0 bytes of it) somewhere else, removing the
originals.
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Well, you don't get to be a kernel hacker simply by looking ---
good in Speedos. -- Rusty Russell
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next prev parent reply other threads:[~2012-07-09 20:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 19:14 btrfs fi df won't show total= Jan Engelhardt
2012-07-09 19:25 ` Hugo Mills
2012-07-09 20:06 ` Jan Engelhardt
2012-07-09 20:25 ` Hugo Mills [this message]
2012-07-09 21:52 ` Ilya Dryomov
2012-07-12 7:59 ` Andrei Popa
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