On Apr 14, 2006, at 2:48 PM, David J Brooks wrote:

On Friday 14 April 2006 16:43, Garrett Cooper wrote:
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.

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:


SHUTDOWN_COMMAND="camcontrol stop 0,1,0"

# 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


if [ $STATUS -eq 0 ]

        # there was activity,

        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 :).

Perhaps a softupdate hasn't completed yet?

-- Sure God created the world in only six days,
but He didn't have an established user-base.

Hmmm... didn't think of that. Well, iostat updating did seem to be largely cached (only by running iostat -c did I see a change), so I'm not sure what the best way is of approaching this problem. I sure wish the FreeBSD kernel team would work something out where the hard disk would sleep after a period of time in the kernel ACPI wise >_<.
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