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Partitioning mirrored disks under Mac OS X / Server
Authored by: dkg on Feb 16, '04 11:53:35PM
it would be nice to just mirror the partitions individually, like you say. Unfortunately, apple's diskutil software RAID doesn't look like it allows you to do RAID over partitions, just on disks. See this post to the macosx-admin list for details.

if there's been any change in diskutil's ability to do this since that posting, i haven't been able to find any documentation which describes the change. and (at least as of jaguar today with all the latest patches) trying to do diskutil createRAID on two partitions fails with the same error as mentioned in the link above:

# diskutil createRAID mirror testraid0 HFS+ disk5s2 disk6s3
Timed out waiting for arbitration
Failed to find IOMedia for disk5s2.
Header didn't completly write out!
An error occured attempting to create the raid set
#


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