On 1/10/2010 19:07, MEC Ken wrote:
> Hi
> 
>      I'm trying to use "hdparm" to spin down disk for saving power.
>      It works, but after a while the disk wakes up again (checked by "hdparm
> -C /dev/sda").
>      I guess some processes access disk in the background periodically.
>      Does any one know why this happens or is there any tool can find
> out which process is accessing disk?

a new enough powertop will tell you who woke the disk up...

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