HPE EVA Storage

queue depth with EVA P6500 and HP-UX

Regular Advisor

queue depth with EVA P6500 and HP-UX


We have a  rp7440 server running HP-UX. External disks for this server are in a EVA P6500 storage
Occasionally the users reported performance problems of applications. These problems are due to the slowness in processing i/o.
When we look at sar-d avque column sometimes shows high values (from 10 to 300).
There is a recommendation to increase the value of the queue depth to a higher value (can reach 255).

My question is:
What negative effects could occur if the queue depth increases to a higher value, eg 128?

Thanks in advance.



P.S. This thread has been moved from General to Storage Area Networks (SAN) (Enterprise). - Hp Forum Moderator