Subject: Re: hdparm -M acoustic management for sata disks?
From: Soeren Sonnenburg <kernel@nn7.de>
To: Mark Lord <lkml@rtr.ca>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <485D33A8.60200@rtr.ca>
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Date: Sat, 21 Jun 2008 20:39:21 +0200
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On Sat, 2008-06-21 at 13:00 -0400, Mark Lord wrote:
> Mark Lord wrote:
> >..
> > Here's hdparm-8.9 on a drive that *does* support the feature:
> > 
> > 
> > $ hdparm -I /dev/sda | grep Acoustic
> >           *    Automatic Acoustic Management feature set
> > 
> > $ hdparm -M /dev/sda
> > 
> > /dev/sda:
> > acoustic      = 254 (128=quiet ... 254=fast)
> > 
> > $ hdparm -M128 /dev/sda
> > 
> > /dev/sda:
> > setting acoustic management to 128
> > acoustic      = 128 (128=quiet ... 254=fast)
> > 
> > $ hdparm -M254 /dev/sda
> > 
> > /dev/sda:
> > setting acoustic management to 254
> > acoustic      = 254 (128=quiet ... 254=fast)
> ..
> 
> And one more:
> 
> $ hdparm -M0 /dev/sda
> 
> /dev/sda:
>  setting acoustic management to 0
>  acoustic      = 254 (128=quiet ... 254=fast)
> 
> $ hdparm -I /dev/sda | grep -i acoustic
>         Recommended acoustic management value: 128, current value: 254
>                 Automatic Acoustic Management feature set
> 
> (the lack of a '*' on that last line indicates the feature is no longer enabled).

OK, I guess I have to accept that the drives I have here just don't
support AAM - just couldn't imagine that rather new 750G drives etc
don't have that feature :( 

Thanks for the clarifications,
Soeren
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