From: Brady Chang <bchang@greenplum.com>
To: Eric Sandeen <sandeen@sandeen.net>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: fragmentation question
Date: Thu, 9 Sep 2010 16:41:04 -0700 [thread overview]
Message-ID: <C8AEBEA0.6E43%bchang@greenplum.com> (raw)
In-Reply-To: <4C895A7D.1030208@sandeen.net>
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Thanks,
after couple runs of tpc-H , RHEL 5.4 /dev/sdd is heavily fragmented.
so back to the original problem. it always happen on /dev/sdd
[root@sdw9 data1]# xfs_db -c frag -r /dev/sdb
actual 1773, ideal 1731, fragmentation factor 2.37%
[root@sdw9 data1]# xfs_db -c frag -r /dev/sdd
actual 43384, ideal 1726, fragmentation factor 96.02%
[root@sdw9 data1]# xfs_info /dev/sdb
meta-data=/dev/sdb isize=256 agcount=32, agsize=22469715 blks
= sectsz=512 attr=0
data = bsize=4096 blocks=719030880, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=1
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=32768, version=1
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
[root@sdw9 data1]# xfs_info /dev/sdd
meta-data=/dev/sdd isize=256 agcount=32, agsize=22469715 blks
= sectsz=512 attr=0
data = bsize=4096 blocks=719030880, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=1
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=32768, version=1
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
67 files on both /dev/sdb and /dev/sdd.
On 9/9/10 3:06 PM, "Eric Sandeen" <sandeen@sandeen.net> wrote:
On 09/09/2010 04:59 PM, Brady Chang wrote:
> thanks guys for the feedback.
> iostat shows balanced io between two filesystems.
> testing with RHEL 54, no issues there. seems to be happening on RHEL 55
> only.
There were no xfs changes between 5.4 and 5.5 that should be relevant,
only a single bugfixes for 5.5, related to fallocate error returns.
Just FWIW.
-Eric
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next prev parent reply other threads:[~2010-09-09 23:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-08 0:45 fragmentation question Brady Chang
2010-09-08 1:16 ` Brady Chang
2010-09-08 7:10 ` Emmanuel Florac
2010-09-09 14:12 ` Eric Sandeen
2010-09-09 21:59 ` Brady Chang
2010-09-09 22:06 ` Eric Sandeen
2010-09-09 23:41 ` Brady Chang [this message]
2010-09-10 3:23 ` Stan Hoeppner
2010-09-10 4:57 ` Stan Hoeppner
2010-09-09 23:44 ` Brady Chang
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