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From: Paul Hartman <paul.hartman+gentoo@gmail.com>
Date: Thu, 6 Oct 2011 15:56:07 -0500
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Subject: Re: [gentoo-user] How can I power disk off?
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On Thu, Oct 6, 2011 at 3:31 PM, David W Noon <dwnoon@ntlworld.com> wrote:
> On Thu, 6 Oct 2011 13:21:10 -0700, Mark Knecht wrote about Re:
> [gentoo-user] How can I power disk off?:
>
>> My worry was that if the mdraid daemon saw one drive gone - either
>> when starting to spin down or when one spins up slowly - and if mdraid
>> didn't understand that all this stuff was taking place intentionally
>> then it might mark that drive as having failed.
>
> Surely you would umount the filesystem before spinning down the disk.
> I know I would. =A0Perhaps I'm just old fashioned.

No need for that, I think it would make things inconvenient...
especially if it's your root filesystem! Don't confuse spindown with
parking of the heads. Spindown is just normal power-saving and happens
all the time if you own a laptop or any modern consumer-grade hard
drive... some of them don't even allow you to disable it anymore!