System Stats when I/O Might Be the Bottleneck: 1. iostat -x <delay> <repeats> shows the io for each device: Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sdb 0.00 121.67 0.00 454.67 0.00 7696.00 33.85 0.06 0.12 0.00 0.12 0.04 1.97 sda 0.00 3.00 0.00 5.33 0.00 857.33 321.50 0.07 12.31 0.00 12.31 2.12 1.13 avg-cpu: %user %nice %system %iowait %steal %idle 3.58 0.00 0.69 0.08 ...