search for: 20480m

...requests=512 in their performance tuning doc - these alone seem to make no difference to the latency problem. Setting dirty_expire_centisecs = 1000 and dirty_ratio = 5 does indeed reduce the number of processes in 'b' state as reported by vmstat 1 during an iozone benchmark (./iozone -s 20480m -r 64 -i 0 -i 1 -t 1 -b filename.xls as per 3Ware's own tuning doc) but the problem is obviously still there, just mitigated somewhat. The comparison graphs are in a PDF here: http://community.novacaster.com/attach.pl/7411/482/iozone_vm_tweaks_xls.pdf Incidentally, the vmstat 1 output was...