On Thu, 16 Sep 2010, Alexander Best wrote:
On Wed Sep 15 10, Oliver Fromme wrote:
Warren Block <wbl...@wonkity.com> wrote:
> [...]
> 8. Alexander Motin has an updated CAM version of the ATA system which
> will eventually replace the existing one. In -CURRENT, anyway. He was
> kind enough to look at my event handler. My understanding is that he is
> looking at implementing the head parking/standby mechanism in that new
> code.
The patch below will work with the new CAM ATA driver
(i.e. ada(4) disks). It adds a sysctl, so you can switch
the spin-down off if you're going to just reboot:
# sysctl kern.cam.ada.spindown_shutdown=0
i haven't tested your patch yet, but i don't think deciding whether to spin
down the hdd should be decided merely from the sysctl value.
the hdd should spindown when a shutdown has been issued and not spindown,
if a reboot has been issued.
It's been a while, but the problem I found when comparing the NetBSD
code was that there didn't appear to be a way to tell from within the
FreeBSD driver whether it was a shutdown or reboot.
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