Subject: Re: Who's accessing my disk?
To: Jukka Marin <>
From: Manuel Bouyer <>
List: current-users
Date: 02/07/1999 17:41:22
On Feb 6, Jukka Marin wrote
> Trying to benefit from the atactl program and disk sleep mode on my
> laptop, I mounted / with "nodevmtime" and "noatime" and /usr and /var
> with "noatime".  I then set the disk standby-timer to 5 seconds and
> the disk stops after 5 seconds of inactivity, just as expected.
> However, the disk starts again every 30 seconds - thanks to update.
> Why? :-)

I think sync(2) will always update the timestamp of the superblock.
I have in mind to move update to a kernel thread to solve this problem
(and a few others).

> Sure, cron writes to /var/cron/log every 10 minutes by default (and
> cron has no options at all, so this can't even be disabled). 

It does this because is starts atrun every 10mn. If you kill /usr/libexec/atrun
from your crontab, the log file should be updated less often.

Manuel Bouyer <>