Date: Thu, 4 Feb 2010 08:28:39 -0500 From: Andrew Duane <aduane@juniper.net> To: Warren Block <wblock@wonkity.com>, Erich Dollansky <erich@alogreentechnologies.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: RE: Spin down HDD after disk sync or before power off Message-ID: <AC6674AB7BC78549BB231821ABF7A9AE90006546B4@EMBX01-WF.jnpr.net> In-Reply-To: <alpine.BSF.2.00.1002031946340.11182@wonkity.com> References: <201002031343.o13Dhj7i052507@lurza.secnetix.de> <alpine.BSF.2.00.1002031328060.9787@wonkity.com> <201002041009.05222.erich@alogreentechnologies.com>, <alpine.BSF.2.00.1002031946340.11182@wonkity.com>
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________________________________________
From: owner-freebsd-hackers@freebsd.org [owner-freebsd-hackers@freebsd.org]=
On Behalf Of Warren Block [wblock@wonkity.com]
Sent: Wednesday, February 03, 2010 7:43 PM
To: Erich Dollansky
Cc: freebsd-hackers@freebsd.org
Subject: Re: Spin down HDD after disk sync or before power off
On Thu, 4 Feb 2010, Erich Dollansky wrote:
> In case of a reboot, it is already known when the command is given that t=
he machine will restart without being powered of.
>
> If you spin-down the disk, you lose one start cycle.
>
> It is not that important but if it can be done with just one if, please, =
just do it.
AFAICT ad_shutdown can't tell whether it's called for a reboot or a
poweroff, it's just told to "shut down". So maybe it's one if, but it's
somewhere above ata-disk.c but below reboot(RB_POWEROFF).
-Warren Block * Rapid City, South Dakota USA
________________________________________
You can register for a shutdown even that *does* get to know the "howto" va=
riable; we do this quite a bit on some of our platforms that need special h=
andling at power-off versus halt.
extern void jsrxnle_poweroff_devices(void *junk, int howto);
/* Registering power-off handler to be called at the system shutdown */
EVENTHANDLER_REGISTER(shutdown_final, jsrxnle_poweroff_devices, NULL, S=
HUTDOWN_PRI_LAST + 10);
The howto argument can be checked for RB_POWEROFF:
if (howto & RB_POWEROFF) {
/* Spin Down */
}
--
Andrew Duane Juniper Networks
978-589-0551 10 Technology Park Dr
aduane@juniper.net Westford, MA 01886-3418
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