From: Chris Mason <chris.mason@oracle.com>
To: Alexey A Nikitin <moonwalker@syrius.us>
Cc: Peter Stuge <peter@stuge.se>, Spelic <spelic@shiftmail.org>,
linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: BTRFS fsck tool
Date: Thu, 10 Mar 2011 12:41:21 -0500 [thread overview]
Message-ID: <1299778786-sup-8805@think> (raw)
In-Reply-To: <AANLkTimK8LD50ga=uJuJYJ84Y37KoZPRieGmDHt6HncG@mail.gmail.com>
Excerpts from Alexey A Nikitin's message of 2011-03-10 12:30:54 -0500:
> 2011/3/10 Chris Mason <chris.mason@oracle.com>
> >
> > Which kernel were you on? =C2=A0Was btrfs directly accessing the di=
sks or
> > were things like LVM in use?
> > Recent kernels (.37 and higher) have improved support for barriers =
in
> > LVM and friends, but btrfs directly using the disks should have bee=
n
> > safe for a long time.
>=20
> Now that's funny. I'm using 2.6.32-5-amd64 from Debian Wheezy and
> while btrfs on top of LVM works perfectly stable I have now trouble
> with FS that is directly on partition. Does it make difference
> stability-wise if partition table on disk is GPT rather than
> old-school MS-DOS? Because all my disks, LVM and non-LVM, are set wit=
h
> GPT.
LVM is very reliable, the only time you run into trouble is if you have
a drive with writeback cache enabled (99.99% of sata drives) and LVM
isn't passing the barriers through. GPT vs MS-DOS isn't crucial, its
just important that if you have a writeback cache, you either get the
barriers down to the drive or you turn off the writeback cache.
-chris
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next prev parent reply other threads:[~2011-03-10 17:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-04 23:59 BTRFS fsck tool Alexey A Nikitin
2011-03-05 0:05 ` cwillu
2011-03-05 1:20 ` Alexey A Nikitin
2011-03-05 3:00 ` cwillu
2011-03-05 3:27 ` Alexey A Nikitin
2011-03-05 7:12 ` Helmut Hullen
2011-03-05 10:55 ` Alexey A Nikitin
2011-03-08 2:17 ` Spelic
2011-03-08 4:52 ` Alexey A Nikitin
2011-03-08 6:52 ` Peter Stuge
2011-03-10 12:21 ` Clemens Eisserer
2011-03-10 13:02 ` Chris Mason
2011-03-10 13:29 ` Peter Stuge
2011-03-10 13:58 ` Chris Mason
2011-03-10 17:30 ` Alexey A Nikitin
2011-03-10 17:41 ` Chris Mason [this message]
2011-03-12 22:49 ` Spelic
2011-03-12 23:53 ` Ric Wheeler
2011-03-15 14:18 ` Hubert Kario
2011-03-15 14:22 ` Peter Stuge
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