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Date: Fri, 14 Apr 2006 13:21:12 -0700 (PDT)
From: Bigby Findrake <bigby@ephemeron.org>
To: Garrett Cooper <youshi10@u.washington.edu>
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References: <443F5CE6.4080107@u.washington.edu>
	<20060414091338.GY44921@wantadilla.lemis.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Determining whether or not a SCSI disk is in use
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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
>


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