Thread-topic: diskutil convertRAID hosed my array...
User-agent: Microsoft-Entourage/11.3.3.061214
On 27/6/07 03:06, Dan Shoop wrote:
> The internals of software RAID volumes do not lend themselves to make
> determinations that a corrupted or degraded RAID volume is "broken"
> or of the old flavor.
Dan,
That puzzled me, as it is dead easy to build a version identifier or
something similar into something like a RAID header, so I checked it up -
and sure enough Apple *does* build a version number into the header, which
changed from AppleRAID 1 (pre-Tiger) to 2 (Tiger). So it would appear to be
merely a matter of checking the version number - hardly onerous?
> At 9:42 PM +0100 6/26/07, Howard Oakley wrote:
>> In fairness to both my original correspondent, and Christopher, I do not
>> think that the docs have any warning that this would happen. If anyone can
>> find a KB article or anything else that does warn of it, then I would be
>> very grateful to know of it.
>
> The process for preparing a system installation for Tiger relies
> heavily on the Worksheet which if stepwise used and you wish a RAID 1
> device is highly suggestive that the disk be erased (that is to
> follow the steps it would be the next thing you'd do.) It doesn't say
> you must -- and as the poster found out you don't *have to* -- but it
> relatively follows and is implied if you follow things stepwise.
>
> Additionally the Migration Guide has a whole section on
> "Understanding What Can Be Re-USed" and it doesn't mention reusing
> and RAID volumes, therefore it's implied you don't want to. It
> mentions re-using settings, but granted doesn't by any long stretch
> jump out and say best practice for how this is done.
>
> I also don't believe that remote installs or upgrades permit this,
> but it's been a while since I'd have tried so I remember for sure and
> don't want to Scooter Libby.
I'll take that as a "no" to my question seeking docs that warn of the
problem, then.
Thanks,
Howard.
Dr Howard Oakley
The Works columnist for MacUser magazine (UK)
http://www.macuser.co.uk/http://www.ehnoakley.com/
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