On Thu, 16 Oct 2003 00:09:18 -0700, Brion Vibber
<brion(a)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