Determining whether or not a SCSI disk is in use
Hello again list, Just wondering if there was any way where I could possibly tie into the kernel or do something where I could determine whether or not a disk is currently 'in use'. Problem: I'm trying to spin down my disks periodically via a cronjob to save energy, reduce noise, and heat, and I don't want my disk to be spun down if it is currently in use. I do listen to music and watch videos for extended periods of time, so I'd rather not cause undue stress to the hard disks and cause the program I'm using on another machine to choke and die. Thanks! -Garrett ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Determining whether or not a SCSI disk is in use
On Friday, 14 April 2006 at 1:27:18 -0700, Garrett Cooper wrote: Hello again list, Just wondering if there was any way where I could possibly tie into the kernel or do something where I could determine whether or not a disk is currently 'in use'. Problem: I'm trying to spin down my disks periodically via a cronjob to save energy, reduce noise, and heat, and I don't want my disk to be spun down if it is currently in use. I do listen to music and watch videos for extended periods of time, so I'd rather not cause undue stress to the hard disks and cause the program I'm using on another machine to choke and die. This all depends on what you mean by in use. Do you mean recently accessed? Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers. pgpYmfxOtkhOZ.pgp Description: PGP signature
Re: Determining whether or not a SCSI disk is in use
Greg 'groggy' Lehey wrote: On Friday, 14 April 2006 at 1:27:18 -0700, Garrett Cooper wrote: Hello again list, Just wondering if there was any way where I could possibly tie into the kernel or do something where I could determine whether or not a disk is currently 'in use'. Problem: I'm trying to spin down my disks periodically via a cronjob to save energy, reduce noise, and heat, and I don't want my disk to be spun down if it is currently in use. I do listen to music and watch videos for extended periods of time, so I'd rather not cause undue stress to the hard disks and cause the program I'm using on another machine to choke and die. This all depends on what you mean by in use. Do you mean recently accessed? Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers. Yes. Recently accessed or is being accessed. -Garrett ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Determining whether or not a SCSI disk is in use
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 ' NR2 $20 { print x } ' |\
grep x /dev/null
STATUS=$?
if [ $STATUS -eq 0 ]
then
# there was activity,
$SHUTDOWN_COMMAND
fi
/-/
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Re: Determining whether or not a SCSI disk is in use
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 ' NR2 $20 { print x } ' |\
grep x /dev/null
STATUS=$?
if [ $STATUS -eq 0 ]
then
# there was activity,
$SHUTDOWN_COMMAND
fi
/-/
Workaholics procrastinate too... I'll sleep tommorow.
finger://[EMAIL PROTECTED]
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Re: Determining whether or not a SCSI disk is in use
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 ' NR2 $20 { print x } ' |\
grep x /dev/null
STATUS=$?
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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Re: Determining whether or not a SCSI disk is in use
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.
-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 ' NR2 $20 { print x } ' |\
grep x /dev/null
STATUS=$?
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 :).
Perhaps a softupdate hasn't completed yet?
David
--
Sure God created the world in only six days,
but He didn't have an established user-base.
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Re: Determining whether or not a SCSI disk is in use
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.
-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 ' NR2 $20 { print x } ' |\
grep x /dev/null
STATUS=$?
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 :).
Perhaps a softupdate hasn't completed yet?
David
--
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 _.
-Garrett
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