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From: Tejun Heo <htejun@gmail.com>
To: Jan Engelhardt <jengelh@computergmbh.de>
Cc: James.Bottomley@steeleye.com,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-scsi@vger.kernel.org
Subject: Re: Disk spindown on rmmod sd_mod
Date: Fri, 26 Oct 2007 19:25:42 +0900	[thread overview]
Message-ID: <4721C0A6.4000200@gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0710022050200.28124@fbirervta.pbzchgretzou.qr>

Jan Engelhardt wrote:
> I am using 2.6.23-rc9 with pata_sis. `modprobe -r sd_mod`, which I ran 
> from initramfs, caused all my disks to spindown - sd even told me so.
> 
> I recall there has been talk a while back about whether to spin down 
> disks on shutdown or not, but I do not think it touched the removal of 
> sd_mod, did it? So either way, can someone fill me in why the spindown 
> is done?

The problem is that it's difficult to tell why a disk is going down from
sd_shutdown(), so it issues STOP unless system state is SYSTEM_RESTART.
 Maybe we need to issue STOP only for SYSTEM_HALT, SYSTEM_POWER_OFF and
SYSTEM_SUSPEND_DISK.

Thanks.

-- 
tejun

      reply	other threads:[~2007-10-26 10:25 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-02 18:53 Disk spindown on rmmod sd_mod Jan Engelhardt
2007-10-26 10:25 ` Tejun Heo [this message]

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