Determining whether or not a SCSI disk is in use

[Bigby Findrake]

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


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