Monitoring Disk I/O
The primary tool to use in troubleshooting disk I/O problems is iostat.
In particular, use iostat -xn 5 during peak usage times to observe the I/O requests being directed at your disk devices.
iostat -xn 5
The system displays the following results:
extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.1 0.0 0.5 0.3 0.0 0.0 77.0 14.0 0 0 c0t0d0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 fd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 10.7 0 0 c0t2d0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 0 0 ultra5:vold(pid259) extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c0t0d0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 fd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c0t2d0 ...
Get Inside Solaris™ 9 now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
