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Queue depth setting for AIX server with Emulex HBAs connected to V-MAX
I have an AIX server (5.3) having two Emulex HBAs (LP11000) and is connected to V-Max. It has 69 devices (all TDEVs metas). How to calculate the ideal Queue depth for it. Also by how much does the performance of the server increase if we change the queue depth value.
gc_emc
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April 5th, 2011 00:00
Hi Aditya,
EMC ODM definitions include a default value for HBA queue depth which is the EMC recommended value.
We do not advise changing this value.
To determine the SCSI queue depth for a device in AIX issue the AIX command "lsattr -l hdiskx -E", where x is the hdisk device number.
To change the queue depth value issue the command:
"chdev -l hdiskx -a queue_depth=X". where x is the hdisk device number and X is the queue depth value.
I would recommend contacting IBM to discuss the performance of the server in relation to the queue depth value.
Regards,
Gearóid
Anonymous
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April 5th, 2011 13:00
Thanks Gearóid