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HD spin down with hdparm : HD always wakes up !!!

Hello folks !

I am now in the process to reduce power consumption on my Woody
box (great, isn't it?) So far I've managed to get DPMS working so
that my monitor will go to standby mode when I'm AFK.

Now the question: I have two HD, /dev/hda and /dev/hdc that are
mounted as follows:

Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/hda2              7384424   1895048   5114260  28% /
/dev/hda3              3075536   1283008   1636296  44% /usr/local
/dev/hdc2              3909084   2509760   1200748  68% /home
/dev/hda1              9428928   5506328   3922600  59% /windows

At boot time I have the following commands executed:
hdparm -S 180 /dev/hda
hdparm -S 180 /dev/hdc
so that my two HDs will go to sleep after 15 min.

Everything is fine with /dev/hdc (/home), but /dev/hda will
always wake up after a few seconds of sleep !

I can't figure out what's provoking this behaviour?

Here are my running processes:
  PID TTY          TIME CMD
    1 ?        00:00:03 init
    2 ?        00:00:00 keventd
    3 ?        00:16:15 kapm-idled
    4 ?        00:00:00 ksoftirqd_CPU0
    5 ?        00:00:00 kswapd
    6 ?        00:00:00 bdflush
    7 ?        00:00:00 kupdated
   44 ?        00:00:00 khubd
  200 ?        00:00:00 syslogd
  203 ?        00:00:00 klogd
  212 ?        00:00:00 inetd
  215 ?        00:00:00 jabberd
  218 ?        00:00:00 jabberd
  229 ?        00:00:00 lpd
  242 ?        00:00:00 safe_mysqld
  275 ?        00:00:00 mysqld
  277 ?        00:00:00 mysqld
  278 ?        00:00:00 mysqld
  288 ?        00:00:00 mysqld
  290 ?        00:00:00 slapd
  294 ?        00:00:00 slapd
  295 ?        00:00:00 slapd
  297 ?        00:00:02 xfs
  301 ?        00:00:00 proftpd
  322 ?        00:00:00 gdm
  327 ?        00:00:00 gdm
  328 ?        00:04:22 XFree86
  409 tty2     00:00:00 getty
  410 tty3     00:00:00 getty
  411 tty4     00:00:00 getty
  412 tty5     00:00:00 getty
  413 tty6     00:00:00 getty
  421 ?        00:00:00 gnome-session
  453 ?        00:00:01 xscreensaver
  460 ?        00:00:00 gnome-smproxy
  472 ?        00:00:05 sawfish
  478 ?        00:00:03 panel
  480 ?        00:00:00 gmc
  484 ?        00:00:00 gnome-name-serv
  486 ?        00:00:03 tasklist_applet
  504 ?        00:00:00 adsl-connect
  533 ?        00:00:00 pppd
  541 ?        00:00:00 pppoe
  599 ?        00:00:00 snort
  758 ?        00:00:00 run-mozilla.sh
  763 ?        00:05:39 mozilla-bin
  765 ?        00:00:00 mozilla-bin
  766 ?        00:00:01 mozilla-bin
  767 ?        00:00:00 mozilla-bin
  769 ?        00:00:00 mozilla-bin
  837 ?        00:00:00 apache
  838 ?        00:00:00 apache
  839 ?        00:00:00 apache
  840 ?        00:00:01 apache
  841 ?        00:00:00 apache
  842 ?        00:00:00 apache
  844 ?        00:00:00 apache
  845 ?        00:00:00 apache
  846 ?        00:00:00 apache
  847 ?        00:00:00 apache
  902 ?        00:00:00 sh
  903 ?        00:00:00 gnome-terminal
  904 ?        00:00:00 gnome-pty-helpe
  905 ttyp0    00:00:00 bash
  917 tty1     00:00:00 getty
 1050 ?        00:00:15 emacs
 1051 ttyp2    00:00:00 gnuserv
 1064 ttyp0    00:00:00 bash
 1092 ?        00:00:00 cron
 1095 ?        00:00:00 atd
 1124 ttyp0    00:00:00 ps

Any idea ????

Any help (really) appreciated !

Thanks in advance.

Cheers,

-- 
Dominique Deleris
http://potatoworld.tuxfamily.org
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