Re: HD spindown and fs cache writeback

[david.gardner@philips.com]

Ok, having now tried noflushd it seems to do a pretty good job of
getting the disk on my Sony Vaio C1XE to spin down, and it will
stay spun down while doing compile cycles on a small test program
(actually, the whole source to cdparanoia, so not that small):
while true ; do make clean all <packaging commands> ; done 
doesn't make the disk spin up.  :-)

Mobile-update won't work on kernels 2.2.11 and above, as the 
sys_bdflush call will make it do_exit(0) on first call.  And
noflushd _requires_ 2.2.11 or above, so noflushd and mobile-update
will be mutually exclusive.

Also, I didn't set the noatime option for mount and this all still
seemed fine.

Further, to address the spindown of disks when on AC power/battery,
noflushd will let you have multiple timeouts and send it SIGHUPs,
so you could use apmcd to detect power changes and send it the 
required signal to keep things as you want for AC/battery setup.


</success report>


	Dave