On Apr 14, 2006, at 1:21 PM, Bigby Findrake wrote:
On Fri, 14 Apr 2006, Bigby Findrake wrote:
I'm sorry, I'm an idiot - the script, in its current incarnation,
needs to be modified. It's doing exactly what you don't want it to
do - it will shut down the disk if there was activity. The if
statement should read:
if [ $STATUS -ne 0 ]
On Fri, 14 Apr 2006, Garrett Cooper wrote:
Yes. Recently accessed or is being accessed.
-Garrett
Well, for a shell-script-hack, which (i) requires no new kernel
and (ii) could be fairly portable but (iii) could conceivably miss
some activity, you could do something like the following:
#!/bin/sh
DISKDEV=da0
SHUTDOWN_COMMAND="camcontrol stop 0,1,0"
SECONDS=60
# check for activity
# watch iostat for $SECONDS seconds for anything
iostat -d $DISKDEV 1 5 | awk ' NR>2 && $2>0 { print "x" } ' |\
grep x > /dev/null
STATUS=$?
if [ $STATUS -eq 0 ]
then
# there was activity,
$SHUTDOWN_COMMAND
fi
Brilliant! That's exactly what I was looking for!
The only thing I've noticed is that there is a small amount of data
being transferred while the disk is idle, so perhaps the sampling
needs to watch for the amount of data as well as the overall
transactions being done to properly fix up a script to do this?
Anyhow, I'll end up doing that, but thanks for the command :).
-Garrett
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