Messages in this thread | | | From | Rob Landley <> | Subject | Re: Weird hard disk noise on shutdown (bug #7674) | Date | Wed, 16 May 2007 19:47:35 -0400 |
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On Wednesday 16 May 2007 5:15 am, Francesco Pretto wrote: > - everyone else: > // continue to do nothing :-) > reboot();
That would be cool, but the impression I got from http://linux-ata.org/shutdown.html was that shutdown commands were supposed to _add_ quiescing of drives in order to avoid emergency head parking on poweroff.
That article says:
> Distros should update their shutdown(8) to do the followings. > Check whether /sys/modules/libata/parameters/spindown_compat exists. If it > does, write 0 to it. For each libata harddisk > Check whether /sys/class/scsi_disk/h:c:i:l/manage_start_stop exists. If it > doesn't, synchronize cache and spin the disk down as before. If it does, do > nothing and continue to the next disk. The file is also accessible as > /sys/block/sdX/device/scsi_disk:*/manage_start_stop.
You're saying all this is to work around kernels _before_ 2.6.22, and instead of updating your shutdown you could just either update the kernel instead?
> If exists some, at this point, exotic shutdown(8) implementation that > is trying to issue STANDBYBOW on libata/scsi devices, it will get a > fat warning. The warning could also state that the only supported way > is to leave complete responsibility of spinning down the hard disks to > kernel, so eventually it could be cleaned of checks and compatibility > options.
I'm all for leaving this to the kernel. I play in the embedded space a lot, so the less I can get away with doing, the better. :)
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