T
TheMadDBA
Guest
check the queue_depth settings on all of your disks using lsattr -El hdiskname Queue depths are not used. In fact, I'd argue we had a QD of 1 the entire time on the new systems. Does Progress do any concurrent read IO at all? When you say queue depths are not used do you mean iostat doesn't show any queue waits? queue_depth controls how many IOs can be requested concurrently for that logical disk. Sounds like you have checked all of the obvious stuff though, which wasn't really apparent from the OP 
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