Hot add not supported by version 1.x superblocks?

Hello Neil.

I have a RAID1 built using v1.2 superblocks.  I seem to not be able to hot add a spare drive to this array.
I get the error message:

"HOT_ADD may only be used with version-0 superblocks"

Does this really mean that hot add is not supported for arrays built with v1.x superblocks?
If so this seems like a big regression in functionality.  In this case, are there technical reasons why v1.x cannot support hot add?

I am using a stock 2.6.18 kernel with mdadm v2.5.4


Thanks,
Sean




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