From: Ric Wheeler <ric@emc.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Theodore Tso <tytso@mit.edu>, Eric Sandeen <sandeen@redhat.com>,
Alexey Zaytsev <alexey.zaytsev@gmail.com>,
linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Rik van Riel <riel@surriel.com>
Subject: Re: Mentor for a GSoC application wanted (Online ext2/3 filesystem checker)
Date: Mon, 21 Apr 2008 14:15:41 -0400 [thread overview]
Message-ID: <480CD9CD.70607@emc.com> (raw)
In-Reply-To: <20080421080111.GD14446@one.firstfloor.org>
Andi Kleen wrote:
> On Mon, Apr 21, 2008 at 12:42:42AM +0100, Jamie Lokier wrote:
>> Andi Kleen wrote:
>>> [LVM] always disables barriers if you don't apply a so far unmerged
>>> patch that enables them in some special circumstances (only single
>>> backing device)
>> (I continue to be surprised at the un-safety of Linux fsync)
>
> Note barrier less does not necessarily always mean unsafe fsync,
> it just often means that.
>
> Also surprisingly lot more syncs or write cache off tend to lower the MTBF
> of your disk significantly, so "unsafer" fsync might actually be more safe
> for your unbackuped data.
>
Hi Andi,
Where did you get this data?
I have never heard that using more barrier operations lowers the reliability or
the MTBF of a drive and I look at a fairly huge population when doing this ;-)
ric
next prev parent reply other threads:[~2008-04-21 18:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-18 14:20 Mentor for a GSoC application wanted (Online ext2/3 filesystem checker) Alexey Zaytsev
2008-04-19 1:29 ` Theodore Tso
2008-04-19 9:44 ` Alexey Zaytsev
2008-04-19 18:56 ` Theodore Tso
2008-04-19 19:07 ` Eric Sandeen
2008-04-19 22:04 ` Theodore Tso
2008-04-20 1:24 ` Eric Sandeen
2008-04-20 23:30 ` Andi Kleen
2008-04-20 23:42 ` Jamie Lokier
2008-04-21 8:01 ` Andi Kleen
2008-04-21 11:51 ` Jamie Lokier
2008-04-21 17:29 ` Ricardo M. Correia
2008-04-21 17:40 ` Andi Kleen
2008-04-21 18:27 ` Ricardo M. Correia
2008-04-22 14:48 ` Jamie Lokier
2008-04-21 18:15 ` Ric Wheeler [this message]
2008-04-21 18:25 ` Eric Sandeen
2008-04-21 18:44 ` Ric Wheeler
2008-04-21 18:58 ` Matthew Wilcox
2008-04-21 19:11 ` Ric Wheeler
2008-04-21 8:01 ` Andi Kleen
2008-04-21 0:27 ` Alexey Zaytsev
2008-04-21 9:45 ` Andi Kleen
2008-04-22 16:54 ` Peter Teoh
2008-04-22 17:02 ` Eric Sandeen
2008-04-22 23:37 ` Andreas Dilger
2008-04-23 0:52 ` Eric Sandeen
[not found] ` <480E4950.1090300@oracle.com>
[not found] ` <804dabb00804221633g1f61029dh7b27737134fc0b7a@mail.gmail.com>
[not found] ` <480E7954.9090408@oracle.com>
2008-04-23 1:02 ` Peter Teoh
2008-04-20 23:37 ` Andi Kleen
2008-04-21 2:33 ` Theodore Tso
2008-04-21 14:43 ` Andi Kleen
2008-04-21 0:23 ` Alexey Zaytsev
2008-04-21 12:53 ` Theodore Tso
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