kern/140752: [ata] HDD power-off procedure is not clean

[Alexander Best]

The following reply was made to PR kern/140752; it has been noted by GNATS.

From: Alexander Best <alexbestms at wwu.de>
To: <bug-followup at FreeBSD.org>,
 <dynamic-wind at mail.ru>
Cc:  
Subject: Re: kern/140752: [ata] HDD power-off procedure is not clean
Date: Sun, 06 Dec 2009 03:58:14 +0100 (CET)

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 this issue has been discussed in a few threads already, but i don't think an
 agreement about how to handle the issue was made. see
 http://lists.freebsd.org/pipermail/freebsd-hackers/2009-March/027879.html
 
 attached is a small patch against HEAD which should set any hdd into standby
 immediate state (if supported) before shutdown. before that however hdds get
 their cache flushed which isn't recommended by the document you refer to in
 your pr. so you might want to remove that code from ad_shutdown().
 
 this issue needs to finally get solved imo. the technical part is quite simple
 actually. however discussing this issue has always led to bikesheds. :(
 
 cheers.
 alex
 
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