Orion benchmark relationship IOPS v MBPS

From: John Hallas <John.Hallas@xxxxxxxxxxxxxxxxxx>
To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
Date: Mon, 8 Feb 2010 14:37:37 +0000
I suspected we had performance problems with Disk I/O on server B. AWR stats 
indicated high response times. I therefore ran a fixed Orion benchmark against 
the server (and some others as well). I ran it against 2 disks and took the 
best figures from each run. I picked times when the server load was low and 
re-ran the tests several more times if I suspected that load was higher than 
other servers.



The backend XP4800 array was the same one in each case bar Server D where the 
array was remote to the server (in the other tests the server and SAN were on 
the same site).



The HBA throughput statistics were consistent to the IOPS measurement shown 
above for each server and HBAs were well balanced across each server.



I am comfortable we have a problem with disk I/O on server B but what I do not 
understand is why MPBS on server A and server B are almost the same and yet 
there is a 5fold increase in IOPS on server A.



The test is

 ./orion_hpux_ia64 -run advanced -write 40 -matrix basic -duration 120 
-testname mytest  -num_disks 2





Server A

Server B

Server C

Server D

MBPS

238

228

196

 188

IOPS

13220

2524

13196

10676

Latency

0.75

3.71

0.76

0.84



XP Array (local)

XP Array (local)

XP Array (local)

XP Array (remote)








Changing the write parameter for Orion to either 10% indicated the same 
relationship between servers with B performing much worse again.



Any help appreciated in explaining how I can test further or why the IOPS might 
be so bad on B and yet MBPS has remained roughly the same.





www.jhdba.wordpress.com









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Orion benchmark relationship IOPS v MBPS

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