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Date: Mon, 14 Dec 2009 18:49:51 +0100
From: Michael Weissenbacher <mw@dermichi.com>
MIME-Version: 1.0
Subject: Re: XFS and DPX files
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To: linux-xfs@oss.sgi.com

Hi!
> 
> I've been under the impression that "modern disks" (TM), at minimum the
> server-type products, are supposed to re-use the remaining spin-energy
> for generating the required power and thus writing the content of their
> on-disk write cache to the disks.
> 
Nope, they don't. All disks do is use the remaining spin energy to
mechanically park the disk heads. Server-grade disks should always ship with
their drive write cache turned off per default.
The only thing possible imho would be a small ssd on disk for the cache, but
no disk manufacturer does this either.

cya,
  Michael

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