Hi Lin, What file system type? If you use ext3, the commit interval is a problem. Furthermore, there are WAY more settings that influence this. In order to get it to work reliably, I would suggest taking a look at laptop-mode-tools, or at least at all of the settings that this tool tweaks in order to get the disk to spin down. If you cannot get it to work, the lm-profiler tool (included in laptop-mode-tools) will help you to identify which programs cause disk spinups.
Cheers, Bart 2009/11/4 Lin, Weiliang <[email protected]> > Yes, I have tried 'mount -o remount, noatime /', but no any benefit. > > > > -----Original Message----- > From: Oliver Neukum [mailto:[email protected]] > Sent: 2009年11月4日 16:11 > To: [email protected] > Cc: Lin, Weiliang > Subject: Re: [Discuss] Disk Power Management > > Am Mittwoch, 4. November 2009 06:30:29 schrieb Lin, Weiliang: > > > I profiled the IO W/R using 'iostat' and found that Linux writes disk > every > > 10~15 seconds which means that the hard disk can not achieve 2 minutes > idle > > time. These written operations prevent the harddisk spin down. > > > > Does anyone know what is the root cause of the every 10~15 disk write > even > > on idle system? Is it necessary for Linux? > > You probably change atime on inodes. Have you tried enabling laptop mode? > > Regards > Oliver > > _______________________________________________ > Discuss mailing list > [email protected] > http://lists.lesswatts.org/listinfo/discuss >
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