Last few lines of the xfs_repair;
"resetting inode 817376329 nlinks from 5 to 3
resetting inode 817376333 nlinks from 4 to 3
Maximum metadata LSN (7:785632) is ahead of log (1:2).
Format log to cycle 10.
cache_purge: shake on cache 0x5231e0 left 5 nodes!?
cache_purge: shake on cache 0x5231e0 left 5 nodes!?
cache_zero_check: refcount is 1, not zero (node=0x15319c092410)
cache_zero_check: refcount is 1, not zero (node=0x153184091410)
cache_zero_check: refcount is 1, not zero (node=0x153184089060)
cache_zero_check: refcount is 1, not zero (node=0x15318408ee10)
cache_zero_check: refcount is 1, not zero (node=0x15319c00b210)
done"
Unsure if it usually runs through in only a couple of minutes, disk4 is still showing as unmountable.