thanks mike for the followup, i can confirm the power settings in BIOS are already on maximum performance.
unfortunately i havent made much progress in correcting the issue.
Regarding the mix of 15K and 10K disk, how bad can they impact the performance, I presume any degradation would take it to the lowest speed which is 10K, also i made sure that those disks are not used in the same disk group to avoid any issue. the Auto tiering should be able to differentiate the disk groupd speed difference I guess
one question though, the fabrics and all the the FC components run at 8GB/s, do you think that could be the issue? i just noticed that the benchmarking of MSA 2040 on HPE site is only related to 16GB/s, i would be interested to know what they give on 8GB/S