i/O Thruput to devices in a raidset not even .

 	Hello All (& Dan) ,

 	Unfair I/O thruput ,  Using ...
# uname -a
Linux filesrv2 2.6.26 #1 SMP Wed Jul 23 04:06:23 UTC 2008 i686 pentium4 i386 GNU/Linux

 	While the bonnie runs (ie: 5 of them) completed ,  the thruput just 
pukes @ ~ 17MB/s ,  a single run of bonnie on 2.6.26-rc9 was showing a thruput 
of ~ 107MB/s & 115MB/s on this system .
 	I recorded the outputs from the bonnies & posted them (see below) , 
note the "semop: semop failed.\n: Resource temporarily unavailable" at the printout 
of the time used ,  Maybe something I need to report this to Russel & Tim .

 	Also posted are dmesg output (no errors showing) ,  attached the .config 
for the kernel used .


 	1. dmesg-200807240256-2.6.26
 	   http://www.baby-dragons.com/dmesg-200807240256-2.6.26

 	2. 200807240256-2.6.26.config	<attached>

 	3. 131072MB-bonnie++-run-md3-xfs-15runs.log-200807240256-2.6.26 <5 processes>
 	   http://www.baby-dragons.com/131072MB-bonnie++-run-md3-xfs-15runs.log-200807240256-2.6.26

 	4. 131072MB-bonnie++-run-md3-xfs-15runs.log-200807250222-2.6.26 <1 process>
 	   http://www.baby-dragons.com/131072MB-bonnie++-run-md3-xfs-15runs.log-200807250222-2.6.26

 	5. device-thruput-200807260411-2.6.26.log
 	   http://www.baby-dragons.com/device-thruput-200807260411-2.6.26.log
 	This shows that sda is being driven unmercifully while other drives in 
the array aren't getting anywhere near the expected I/O ,  Very uneven .

 		Tia ,  JimL
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| James   W.   Laferriere | System    Techniques | Give me VMS     |
| Network&System Engineer | 2133    McCullam Ave |  Give me Linux  |
| babydr@baby-dragons.com | Fairbanks, AK. 99701 |   only  on  AXP |
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