OpenWRT and hdd spindown

[clausbruun]

When i issue the hdparm command, the drive spins down as it should, but only for about 5-20 seconds, then it starts spinning again. Anybody knows what program that causes the hdd to spin up again?

[wirespot]

You could try a command like this to identify possible culprits:

lsof |grep /opt/|grep -v ' mem'

(assuming your external drive is mounted under /opt/).

[back2basic]

You could try a command like this to identify possible culprits:

lsof |grep /opt/|grep -v ' mem'

(assuming your external drive is mounted under /opt/).

it isn't external our root filesystem is the build in hdd I think that is the reason

[kfurge]

Anything that touches a log file in /var/log or drops something in /tmp will make it spin back up again. Without mounting / read only, I don't think there's a practical way to make the HDD spin down and stay that way.

- K.C.

[clausbruun]

So only solution will be to move /tmp and /var/log to for example an usb stick ?

[kfurge]

So only solution will be to move /tmp and /var/log to for example an usb stick ?

That's a possibility, but I think it would die rather quickly from all of the writes and you never know when it's going fail.

I think a better alternative is to leave a fluid dynamic bearing HDD on and idling at low RPM. With proper thermal management, it should run virtually forever.

- K.C.

http://www.wdc.com/en/library/eide/2579-001052.pdf

[back2basic]

A new openwrt image is created that is able to boot from a usb device
Then the hdd can be put into sleep



http://www.wl700g.homelinux.net/drupal/?q=node/98 for more info