From: Dave Chinner <david@fromorbit.com>
To: Peter Grandi <pg_mh@sabi.co.UK>
Cc: Michael Monnerie <michael.monnerie@is.it-management.at>, xfs@oss.sgi.com
Subject: Re: I/O hang, possibly XFS, possibly general
Date: Wed, 8 Jun 2011 15:18:42 +1000 [thread overview]
Message-ID: <20110608051842.GO32466@dastard> (raw)
In-Reply-To: <19950.12549.541440.285348@tree.ty.sabi.co.UK>
On Tue, Jun 07, 2011 at 03:09:09PM +0100, Peter Grandi wrote:
> Personally I'd rather have a file system design with space
> reservations (on detecting an append-like access pattern) and
> truncate-on-close than delayed allocation like XFS;
Welcome to the 1990s, Peter. XFS has been doing this for 15 years.
It is an optimisation used by the delayed allocation mechanism,
not a replacement for it. You might have heard the term
"speculative preallocation" before - this is what it does.
FYI, ext3 has a space reservation infrastructure to try to ensure
contiguous allocation occurs without using delayed allocation. It
doesn't work nearly as well as delayed allocation in ext4, btrfs or
XFS...
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2011-06-08 5:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-02 14:42 I/O hang, possibly XFS, possibly general Paul Anderson
2011-06-02 16:17 ` Stan Hoeppner
2011-06-02 18:56 ` Peter Grandi
2011-06-02 21:24 ` Paul Anderson
2011-06-02 23:59 ` Phil Karn
2011-06-03 0:39 ` Dave Chinner
2011-06-03 2:11 ` Phil Karn
2011-06-03 2:54 ` Dave Chinner
2011-06-03 22:28 ` Phil Karn
2011-06-04 3:12 ` Dave Chinner
2011-06-03 22:19 ` Peter Grandi
2011-06-06 7:29 ` Michael Monnerie
2011-06-07 14:09 ` Peter Grandi
2011-06-08 5:18 ` Dave Chinner [this message]
2011-06-08 8:32 ` Michael Monnerie
2011-06-03 0:06 ` Phil Karn
2011-06-03 0:42 ` Christoph Hellwig
2011-06-03 1:39 ` Dave Chinner
2011-06-03 15:59 ` Paul Anderson
2011-06-04 3:15 ` Dave Chinner
2011-06-04 8:14 ` Stan Hoeppner
2011-06-04 10:32 ` Dave Chinner
2011-06-04 12:11 ` Stan Hoeppner
2011-06-04 23:10 ` Dave Chinner
2011-06-05 1:31 ` Stan Hoeppner
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