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   xfs_repair    ( 8 )

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DIRTY LOGS

Due to the design of the XFS log, a dirty log can only be
       replayed by the kernel, on a machine having the same CPU
       architecture as the machine which was writing to the log.
       xfs_repair cannot replay a dirty log and will exit with a status
       code of 2 when it detects a dirty log.

       In this situation, the log can be replayed by mounting and
       immediately unmounting the filesystem on the same class of
       machine that crashed.  Please make sure that the machine's
       hardware is reliable before replaying to avoid compounding the
       problems.

       If mounting fails, the log can be erased by running xfs_repair
       with the -L option.  All metadata updates in progress at the time
       of the crash will be lost, which may cause significant filesystem
       damage.  This should only be used as a last resort.