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тАО10-31-2008 06:41 AM
тАО10-31-2008 06:41 AM
I cant find definative info regarding this anywhere.
Help appreciated
Darren
Solved! Go to Solution.
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тАО10-31-2008 06:47 AM
тАО10-31-2008 06:47 AM
Re: Qlogic and Emulex Queue Length for EVA's
there was the discussion on the perf counters queue length included in this thread:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1225464283286+28353475&threadId=1239472
but the definite numbers probably dont exist and it always depends on the specific host/app/storage configuration and perf parameters...
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тАО10-31-2008 12:15 PM
тАО10-31-2008 12:15 PM
SolutionAs IBaltay has written, there is no single correct number. If there were, it would have been hard-coded. In most cases the default values are fine and it does not make sense to set the max. number on all servers.
This could cause an overrun on the storage array - some older boxes simply crashed and even the EVA has changed the response in a late VCS 3.0xx version to "Queue Full/Busy", because older host operating systems / device drivers did not handle it properly.
(While looking up some things for the text above I've came across an old customer advisory which recommends to limit or even not to change the queue depth when an online upgrade is to be done on an EVA3000/5000.)
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тАО11-01-2008 12:07 PM
тАО11-01-2008 12:07 PM
Re: Qlogic and Emulex Queue Length for EVA's
HBA queue depth setting is fully depended upon configuration (Queue depth on Storage, LUN presentation per HBA etc.). A simple formula is:
Queue Depth = Target Queue Depth / Total number of LUNs mapped from the array
In Windows environment StorPort HBA drivers have changed important behavior about QD over SCSIPort drivers. StorPort drivers manages QD per LUN basis whereas SCSIPorts used to manage per target basis. Mentioned at:
http://download.microsoft.com/download/5/6/6/5664b85a-ad06-45ec-979e-ec4887d715eb/Storport.doc
Hope that I am not answering your question directly (since there is no direct answer) but helping you to understand it bit more.
My 2 cents worth.
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тАО11-03-2008 01:19 AM
тАО11-03-2008 01:19 AM