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From: Scott Long <scottl@samsco.org>
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Date: Thu, 10 Dec 2009 07:31:41 -0700
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To: Alexander Motin <mav@freebsd.org>
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Cc: FreeBSD-Current <freebsd-current@freebsd.org>, freebsd-arch@freebsd.org
Subject: Re: Testing CAM wrapper for ata(4) controller drivers
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On Dec 10, 2009, at 3:02 AM, Alexander Motin wrote:
> Alexander Motin wrote:
>> The main regression of the new mode is a lack of ataraid  
>> alternative, to
>> support cheap BIOS-based ATA RAIDs. If somebody has time and wish to
>> port that code from inside ata(4) into GEOM module, to make it work  
>> over
>> CAM also, I would appreciate that and propose a help, if needed.
>
> May be it would be easier to just teach gmirror, gstripe and gconcat  
> to
> handle ATA RAIDs metadata formats, to not duplicate and support the  
> rest
> of code.
>

The existing graid modules are not well suited for learning new  
metadata.  I have plans for restructuring them into a stack within  
GEOM that handles metadata separate from the transforms.

Scott