linux-kernel - Re: sd_resume redundant? [was: [PATCH] libata: implement ata_wait_after

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Message-id: <4650891F.80301@shaw.ca>
Date:	Sun, 20 May 2007 11:45:03 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Indan Zupancic <indan@....nu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Tejun Heo <htejun@...il.com>
Subject: Re: sd_resume redundant?  [was: [PATCH] libata: implement
 ata_wait_after_reset()]

Indan Zupancic wrote:
>>> Everything seems to work fine without sd_resume(), so why is it needed?
>> Because not all disks spin up without being told to do so and like it or
>> not spinning disks up on resume is the default behavior.  As I wrote in
>> the other reply, it would be worthwhile to make it configurable.
> 
> Not even after they receive a read command? Ugh.

ATA disks are supposed to spin up, yes. SCSI disks require a command to 
tell them to spin up if they're in the "stopped" state.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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