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тАО12-28-2010 08:28 AM
тАО12-28-2010 08:28 AM
Latency on Clariion & SVC but none on Symmetrix
There's a strange behaviour on our elderly 11.00 servers
A 2 & 6 seconds latencies occurs when opening a Clariion or IBM SVC LUNz.
But, when accessing Symmetix LUN, the result appears instantly :
example :
Average results of the commmand : time dd if=/dev/rdsk/c80t0d0 of=/dev/null bs=1024k count=10
Symmetrix : 0.2s
Clariion CX3-80: 3s
IBM SVC : 6s
Same results with a simple "diskinfo". The big lag occurs.
But with a higher volume of data, we see a normal throughput (if substract the lag) :
Average results : bs=1024k count=300
Symmetrix : 9s
Clariion : 6s
IBM SVC : 9.5s
Average results : bs=1024k count=1000
Symmetrix : 41s
Clariion : 14,4s
IBM SVC : 17,7s
The server is fully patched and the FC driver is the newest-one.
Does somebody have the idea ?
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тАО12-28-2010 09:06 AM
тАО12-28-2010 09:06 AM
Re: Latency on Clariion & SVC but none on Symmetrix
Also the load on the devices as well as their front-end cache memory sizes can cause wildly varying performance stats that I know of. So checking the cache sizes and load amount on each of these back end frames, may bring a better explanation to the situation.
UNIX because I majored in cryptology...
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тАО12-28-2010 09:15 AM
тАО12-28-2010 09:15 AM
Re: Latency on Clariion & SVC but none on Symmetrix
Your Clariion is even an older version, so add that to the results as well.
Your apples to oranges. Not the same.
Rgrds,
Rita
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тАО02-08-2011 04:14 AM
тАО02-08-2011 04:14 AM
Re: Latency on Clariion & SVC but none on Symmetrix
The bandwidth is limited by the 1gbs hba cards not by the array itself.
The patch who saved my perfs is PHKL_34186.
And here's the root cause :
open(2) command sequence takes a long
time for SPC-2 compliant devices.
# time dd if=/dev/rdsk/c80t0d0 of=/dev/null bs=1024k count=10
Before the patch :
IBM SVC : 6s
After :
IBM SVC : 0.2s
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тАО02-10-2011 06:29 AM
тАО02-10-2011 06:29 AM