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Re: diskutil convertRAID hosed my array...


On Jun 29, 2007, at 12:42 PM, email@hidden wrote:

"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.


It has been a few months since I've done it, but I'm pretty sure that
the last time I tried this -- i.e. having an AppleRAID 1 array become
marked as degraded in Tiger, then convert & repair the mirror, it
worked fine. It just didn't this time; the worrying thing is from
comments like yours when you indicate it virtually never works in the
real world.

The difference between AppleRAID 1 and 2 partitions is that version 1 puts the data in a fixed sized structure at the beginning of each volume partition and version 2 puts it in XML at the end of the partition. The conversion from version 1 to 2 therefore involves converting the data in the version 1 header to XML and writing it out to the end of the volume partition, shrinking the size of the volume partition and changing the start point for the volume partition. The size of the volume itself must also be shrunk. (The code to shrink volumes in Tiger is not 100% reliable so this may be the step which is failing.)

If you want to avoid the risk of trashing your AppleRAID volume, you could convert it to SoftRAID format and rebuild it as a SoftRAID mirror. The SoftRAID application can convert either AppleRAID version 1 or version 2 volumes to SoftRAID format. Note that the current version of SoftRAID, 3.6.2 will only run in Tiger. If you want the version which runs under Panther, you can request version 3.5.6 from email@hidden.

	Tim Standing
	VP Engineering
	SoftRAID, LLC
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