Subject: Re: CVS commit: src/sys/dev/ata
To: Charles M. Hannum <firstname.lastname@example.org>
From: Cherry G. Mathew <email@example.com>
Date: 04/05/2006 09:10:53
Moving thread to tech-kern, tech-macppc:
On 4/4/06, Charles M. Hannum <firstname.lastname@example.org> wrote:
> On Tue, Apr 04, 2006 at 07:11:45AM +0000, Cherry G. Mathew wrote:
> > Sleeps hard disk just before system shutdown.
> > Some hardware (eg: Apple iBooks) don't do this automatically
> > and the harddisk behaves as if the power plug were pulled.
> > Closes PR: kern/32766
> This is not an acceptable implementation. It causes the disks to spin
> down when you're doing a "reboot" -- which puts considerably more wear
> on the drive than an "emergency retract" ever did, and is also really,
> really annoying to wait for.
> Furthermore, doing an "emergency retract" was never a big deal in the
> first place. Who cares?
I'm no expert on hard disks but in the case of this particular issue
on the iBook:
- Open Firmware, Linux and MacOSX do not cause this sound ( the
emergency retract) to happen.
- It is a SMART parameter, which means there is some significance to the ev=
> Please back it out at your earliest convenience.
Done, and sorry for the hasty commit.
Since it looks like this is a macppc specific thing, maybe a better
way to do this would be to spin-down the disk in:
Would it be ok to call: wd_standby() directly from here, or does it
need to go through an "apm" wrapper, as is done on i386 ?