Determining whether or not a SCSI disk is in use

Garrett Cooper youshi10 at
Fri Apr 14 19:35:27 UTC 2006

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
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Yes. Recently accessed or is being accessed.

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