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From: Jeff Garzik <jgarzik@pobox.com>
To: Matt Domsch <Matt_Domsch@dell.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: DDF Trial Use draft specification now publicly available
Date: Thu, 11 Mar 2004 15:43:18 -0500	[thread overview]
Message-ID: <4050CF66.8090409@pobox.com> (raw)
In-Reply-To: <20040311154542.GA6173@lists.us.dell.com>

Matt Domsch wrote:
> The Disk Data Format (DDF) trial use draft spec has now been published
> by SNIA.  This is the common on-disk metadata format that
> RAID vendors have been driving towards, which should allow one to move
> disks from one vendor's RAID controller to another vendor's RAID
> controller without the backup-rebuild-restore that's currently needed.
> 
> http://www.snia.org/tech_activities/ddftwg

Thanks for posting this.

I haven't even read past "locality" section to find brokenness.  DDF 
RAID groups (a.k.a. each RAID array) must store information about other 
RAID groups "on the controller."  There is also apparently 
per-controller state information one must care about.  While I 
understand why they would want this, this also means the format is quite 
a bit less flexible than md, and in some respects, more difficult to 
work with.

/me continues reading...



  parent reply	other threads:[~2004-03-11 20:43 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-11 15:45 DDF Trial Use draft specification now publicly available Matt Domsch
2004-03-11 16:08 ` Samuel Davidoff
2004-03-11 16:18   ` Matt Domsch
2004-03-11 20:43 ` Jeff Garzik [this message]
2004-03-12  7:27   ` Scott Long
2004-03-12 21:07     ` Jeff Garzik
2004-03-12 22:27       ` Scott Long
2004-03-11 22:07 ` Jeff Garzik
2004-03-12  7:55   ` Scott Long

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