I just tried a further step - forced the HP blade HBA to 4Gb...suddenly the IOPs 4k test jumped from 80 to 8000 IOPS which is looking much better.
So it looks like using 8Gb or AUTO on the Qlogic HBA is causing some sort of issue...if this is the case then the P2000 will need to be limited to 4Gb too.
My understanding is that 4Gb fiber should work OK on 8Gb switches without having to force the whole fabric to 4Gb...am I wrong?
Anyone else seen issues like this?