Hi all,
After a week and a bit of googling, experimenting and frustration I'm
posting here and hoping I can get some clues on what could be wrong
with my 5 disk RAID5 SATA array.
The array in question is:
md1 : active raid5 sdg1[0] sdf1[1] sde1[3] sdd1[2] sdc1[4]
1172131840 blocks level 5, 1024k chunk, algorithm 2 [5/5] [UUUUU]
All 5 drives are connection to a sil_sata controller (a 3112 & a 3114)
set up as a simple SATA controller (ie no RAID here).
Once the system buffer is full, write speeds to the array are usually
under 20MB/sec.
I am currently running CentOS 5.3 (kernel
2.6.18-128.1.10.el5.centos.plus).
I have lodged a bug report against RHEL 5.3, as I believe something is
not quite right here, but haven't been able to narrow down the exact
issue.
https://bugzilla.redhat.com/show_bug.cgi?id=502499
Using bonnie++ to benchmark the array, it shows sequential block reads
at 90MB/sec but writes at 11MB/sec across the RAID5 array - a
difference I really didn't expect.
Any pointers on how to try to tackle this one and figure out the root
cause of the problem would be VERY helpful!
--
Steven Haigh
Email: netwiz@xxxxxxxxx
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
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