Oops - XFS mount after replacing wrong RAID5 drive

[Andrew Klaassen <ak@xxxxxxx>]

I think I may have just replaced the wrong drive after a SW
RAID5 drive failure.

And then I mounted the XFS filesystem read-write.  (Doh!)

Can I put the old probably-good drive back into the array and
replace the actually-bad drive?

Would XFS's log replay have written enough to the array to get
the RAID5 hopelessly out of sync with the old probably-good
drive?

(The XFS filesystem did not unmount cleanly after the first
drive failure.  That's why I'm assuming that it replayed its log
when I mounted it after replacing the drive.)

How do I mount the filesystem without writing anything at all to
the array?

Thanks.

Andrew Klaassen