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Re: reservation ran out?

To: Eric Sandeen <sandeen@xxxxxxxxxxx>
Subject: Re: reservation ran out?
From: Gavin Peters <gpeters@xxxxxxxxxxx>
Date: Sun, 6 Sep 2009 08:17:19 -0400
Cc: Gavin Peters <gpeters@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4AA334AA.9050908@xxxxxxxxxxx>
References: <20090905161102.GQ22496@outrider> <4AA334AA.9050908@xxxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
On Sat, Sep 05, 2009 at 11:03:54PM -0500, Eric Sandeen wrote:
> Gavin Peters wrote:
>> I just created bug 849, about a reservation problem I'm seeing
>> on my x86_64 system on ubuntu jaunty (2.6.28-15-generic).
>> http://oss.sgi.com/bugzilla/show_bug.cgi?id=849
>> Am I doin' something wrong, or is this a real problem?
> Sounds like a real problem.
> Any reproducible testcase?

Alas, no; I was running mythtv, and my disk was somewhat fragmented.

root@mythmaker:~# xfs_db -c frag -r /dev/sda7
actual 17379, ideal 98, fragmentation factor 99.44%
root@mythmaker:~# xfs_db -c frag -r /dev/sdb1
actual 4268, ideal 53, fragmentation factor 98.76%

The disk that was having the trouble was sda7, my sdb1 was fine.  

Mythtv fragments disks so badly by appending to two, or three files,
simultaniously and fsyncing on them a lot.  Perhaps some hacking at
that will give a reproduction, I'll see if I can take the time and do

I've since defragmented both disks though; and I've set a large
allocsize (512m) to prevent future fragmentation.  We'll see if I get
another crash.

- Gavin

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