Repairing large partition

[maillists0 at gmail.com]

Pardon if this is the wrong list for this question.

I had a 50T xfs partition, spread across 3 storage devices which were lvm'd.
After a power failure, 2 disks on one device failed. It was raid5, so that
data is unrecoverable.

I replaced the failed disks and rebuilt that array. I can mount the
partition and see data on the first 2 devices. 'I ran xfs_repair -n' to see
what might be done a couple of days ago and it still hasn't finished.  Does
anyone know how I could recreate the partition to include the third device
without losing data from the first two devices? Any help will be greatly
appreciated, including a pointer to the appropriate docs. Thanks.
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