On Thu, 16 Oct 2003 00:09:18 -0700, Brion Vibber brion@pobox.com wrote:
The notable things are that the number of processes in uninterruptible sleep (the 'b' column) is bigger than usual (0-1 with an occasional 2 is normal), a few processes are even swapped out ('w' column), and i/o has gone all wonky; some unusually low input ("bi") and very unusually high output ("bo").
If something writes lots of data to the disk (as 'bo' indicates) it can make others' disk access to stall (uninterruptable wait for disk resources). What filesystem do you use?
Anyway, someone writes lots of data to the disk. (I've seen that in resiserfs, but it shouldn't take more than some seconds.) Dunno about mysql's possible braindeadness. Dunno about your partition layout either, but /proc/ can contain separate stats for every partition (don't remember the name and it's kernel dependent) so you can see where's the activity. Maybe it helps.
Is the 12MB/s indicated in 'bo' the speed limit of your disks, or can they do higher average speed? (For example mine does max 20MB/s, and it means ~15MB/s "average maximum".)
grin