linux-kernel - Re: hdparm -M acoustic management for sata disks?

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Date:	Sat, 21 Jun 2008 12:54:56 -0400
From:	Mark Lord <lkml@....ca>
To:	Soeren Sonnenburg <kernel@....de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: hdparm -M acoustic management for sata disks?

Soeren Sonnenburg wrote:
> 
> Just to be sure, did you mean grep acoustic (lowercase)? Because it is
> listed there under Capabilities: 
> Recommended acoustic management value: 128, current value: 0
..

Ahh.. That part of the output just shows the "current setting field",
which is zero (0) or "invalid" in your case.   That's a display error
in hdparm -- it probably shouldn't bother with that field when the
feature is missing from the feature list that is given lower down
in the output.  (the reason it doesn't discard it today, is that early
drives had the feature but didn't report it lower down.. but we can
distinguish those drives by ATA version number now).

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)
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