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EVA8100 LUN queue depths

EVA8100 LUN queue depths

Does anyone no if the LUN's created on the EVA8100 have there own i/o queue depth or is the queue depth handled by the HBA and O/S
6 REPLIES
IBaltay
Honored Contributor

Re: EVA8100 LUN queue depths

Hi,
maybe this discussion could help you (there are posts also on the queue depths (execution throttles) there:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1225890722661+28353475&threadId=1239472

in general, the best values are OS/app/storage dependent... (to reach the optimum between the writes/reads, etc.)
the pain is one part of the reality

Re: EVA8100 LUN queue depths

Ibaltay - thanks for the reply - however what I am trying to determine is if the EVA virtual LUN's have there own queue depth setting, which it is either possible to modify or check for performance.
IBaltay
Honored Contributor

Re: EVA8100 LUN queue depths

Hi, yes it can be modified either via
a) the HBA BIOS
b) the qlogic SAN surfer or emulex HBA anywhere utilities
the pain is one part of the reality
Mark Poeschl_2
Honored Contributor

Re: EVA8100 LUN queue depths

I fairly sure this HAS NOT changed with the next generation controller that's in the EVAx100 series. EVA controllers have a single queue into which ALL LUNs' I/O gets placed. Any per-LUN queue depth settings are done on the OS/HBA side.

Re: EVA8100 LUN queue depths

Super - thanks for that - however any idea what size the max queue depth is on the controller
IBaltay
Honored Contributor

Re: EVA8100 LUN queue depths