12 Oct
2007
12 Oct
'07
2:34 a.m.
On Thu, 2007-10-11 at 13:42 -0400, Ross Vandegrift wrote:
On Tue, Oct 09, 2007 at 06:58:40PM +0700, Patrick
Shirkey wrote:
Hi,
Thanks everyone again for your suggestions. The above is exactly what I
was thinking of. Thanks very much Ross. I owe you a beer.
I had to make a couple of small changes.
CURRENT=$(cat /proc/diskstats | grep sdb\ | awk '{ print $8 }')
LAST=0
while true; do
echo -en l = $LAST c = $CURRENT \\n
sleep 5
CURRENT=$(cat /proc/diskstats | grep sdb\ | awk '{ print $8 }')
if [ $LAST == $CURRENT ]; then
break
fi
LAST=$CURRENT
done
Cheers.
--
Patrick Shirkey
Boost Hardware Ltd.
Does anyone have a script for monitoring with
iostat or vmstat while in
async mode?
I'm thinking a bash equivalent to the disk monitor on gkrellm which
allows me to know when a transfer has completed.
Something like this will return when five seconds have passed with
no write requests being issues to the device sda:
CURRENT=$(cat /proc/diskstats | grep sda\ | awk '{ print $8 }')
LAST=0
while true; do
LAST=CURRENT
sleep 5
CURRENT=$(cat /proc/diskstats | grep sda\ | awk '{ print $8 }')
if [ "$LAST" == "$CURRENT" ]; then
break
fi
done
/proc/diskstats lists a few things. For complete devices (ie,
/dev/sda instead of /dev/sda1), it lists:
Field 1 -- # of reads issued
Field 2 -- # of reads merged, field 6 -- # of writes merged
Field 3 -- # of sectors read
Field 4 -- # of milliseconds spent reading
Field 5 -- # of writes completed
Field 7 -- # of sectors written
Field 8 -- # of milliseconds spent writing
Field 9 -- # of I/Os currently in progress
Field 10 -- # of milliseconds spent doing I/Os
Field 11 -- weighted # of milliseconds spent doing I/Os
Where field n is the nth field after the device name.