linux-kernel - Re: [git patches] libata hibernation fixes

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Message-ID: <49110093.5090506@rtr.ca>
Date:	Tue, 04 Nov 2008 21:10:27 -0500
From:	Mark Lord <liml@....ca>
To:	Robert Hancock <rwh461@...l.usask.ca>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@...e.cz>, Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git patches] libata hibernation fixes

Robert Hancock wrote:
>
> IDLE IMMEDIATE just transitions the device to the Idle state, which is 
> normally parked/unloaded and spun down.
..

No, you're confusing "IDLE" with "STANDBY".  IDLE just puts the drive
electronics into a lower-power state than "ACTIVE", but normally leaves
the platters spinning.

The "UNLOAD" enhancement causes it to also "unload" or "park" (drive's option)
the heads as part of this action.

"STANDBY" is the command set which parks heads and spins down the platters.

Cheers
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