Thanks, Bart, I will try your tools to see if I can have any new findings. The file system which I use is ext3.
Thanks -Lin ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Bart Samwel Sent: 2009年11月4日 16:19 To: Lin, Weiliang Cc: Oliver Neukum; [email protected] Subject: Re: [Discuss] Disk Power Management 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]<mailto:[email protected]>> Yes, I have tried 'mount -o remount, noatime /', but no any benefit. -----Original Message----- From: Oliver Neukum [mailto:[email protected]<mailto:[email protected]>] Sent: 2009年11月4日 16:11 To: [email protected]<mailto:[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]<mailto:[email protected]> http://lists.lesswatts.org/listinfo/discuss
_______________________________________________ Discuss mailing list [email protected] http://lists.lesswatts.org/listinfo/discuss
