On Fri, 13 Apr 2012, Philip wrote: > Does anyone have an idea what could be the reason for such a bad > performance? 22 Disks in a RAID10 should deliver *way* more throughput. You may already have done so but you can check IO-utilization of the devices with the flag "-x" to "iostat" like for example "iostat -x 2" over a two second interval. Check percentage utilization in the "%util" column to the right. If you are closer to 100 than 0 then they (the disk subsystem) might actually be busy. --jerker