linux-kernel - Re: Disk spin down issue on shut down/suspend to disk

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Date:	Tue, 7 Aug 2007 09:56:29 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Tejun Heo <htejun@...il.com>
Cc:	Michael Sedkowski <sedmich@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: Disk spin down issue on shut down/suspend to disk

On Tue, 07 Aug 2007, Tejun Heo wrote:
> emergency unload.  Emergency unload does shorten the lifespan of the
> disk but you don't have to worry too much about it.  Disks are designed
> to withstand certain number of emergency unloads.

You *do* have to worry about it in any box you turn off daily.  Desktop HDs
will croak fast in that scenario, laptop HDs less so, but still too fast.

A very good laptop HD can last about 20k emergency unloads (this is a unit
that can do about 600k normal unloads in its lifetime).  Desktop and server
HDs don't even come close to those numbers, last time I checked.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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