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<TITLE>Re: fragmentation question</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Thanks,<BR>
after couple runs of tpc-H , RHEL 5.4 /dev/sdd is heavily fragmented. <BR>
so back to the original problem. it always happen on /dev/sdd<BR>
<BR>
<BR>
[root@sdw9 data1]# xfs_db -c frag -r /dev/sdb<BR>
actual 1773, ideal 1731, fragmentation factor 2.37%<BR>
<BR>
[root@sdw9 data1]# xfs_db -c frag -r /dev/sdd<BR>
actual 43384, ideal 1726, fragmentation factor 96.02%<BR>
<BR>
[root@sdw9 data1]# xfs_info /dev/sdb<BR>
meta-data=/dev/sdb isize=256 agcount=32, agsize=22469715 blks<BR>
= sectsz=512 attr=0<BR>
data = bsize=4096 blocks=719030880, imaxpct=25<BR>
= sunit=0 swidth=0 blks, unwritten=1<BR>
naming =version 2 bsize=4096 <BR>
log =internal bsize=4096 <B>blocks=32768</B>, version=1<BR>
= sectsz=512 sunit=0 blks, lazy-count=0<BR>
realtime =none extsz=4096 blocks=0, rtextents=0<BR>
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[root@sdw9 data1]# xfs_info /dev/sdd<BR>
meta-data=/dev/sdd isize=256 agcount=32, agsize=22469715 blks<BR>
= sectsz=512 attr=0<BR>
data = bsize=4096 blocks=<B>719030880</B>, imaxpct=25<BR>
= sunit=0 swidth=0 blks, unwritten=1<BR>
naming =version 2 bsize=4096 <BR>
log =internal bsize=4096 blocks=32768, version=1<BR>
= sectsz=512 sunit=0 blks, lazy-count=0<BR>
realtime =none extsz=4096 blocks=0, rtextents=0<BR>
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<BR>
67 files on both /dev/sdb and /dev/sdd.<BR>
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On 9/9/10 3:06 PM, "Eric Sandeen" <<a href="sandeen@sandeen.net">sandeen@sandeen.net</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>On 09/09/2010 04:59 PM, Brady Chang wrote:<BR>
> thanks guys for the feedback.<BR>
> iostat shows balanced io between two filesystems.<BR>
> testing with RHEL 54, no issues there. seems to be happening on RHEL 55<BR>
> only.<BR>
<BR>
There were no xfs changes between 5.4 and 5.5 that should be relevant,<BR>
only a single bugfixes for 5.5, related to fallocate error returns.<BR>
<BR>
Just FWIW.<BR>
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-Eric<BR>
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