Thread-topic: diskutil convertRAID hosed my array...
User-agent: Microsoft-Entourage/11.3.3.061214
On 28/6/07 18:28, Dan Shoop wrote:
> At 8:33 PM +0100 6/27/07, Howard Oakley wrote:
>> 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?
>
> And since a corrupted disk may have headers which are unreadable...
Dan,
"may" sure. But to date I have not heard of anyone who has successfully
rebuilt a pre-Tiger AppleRAID from Tiger - and I simply don't believe that
the headers were unusably trashed in all those cases. Rather it looks like
the rule is that Tiger *cannot* rebuild pre-Tiger AppleRAIDs, regardless of
the header state - iow no attempt is made to read the version number and act
appropriately, either by having a pre-Tiger rebuild routine, or by bailing
out and saying that it is AppleRAID v 1.
Of course this compounded by the lack of docs to clarify the nature of the
problem.
Howard.
Dr Howard Oakley
The Works columnist for MacUser magazine (UK)
http://www.macuser.co.uk/http://www.ehnoakley.com/
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