I've just discovered (and fixed) a serious data corruption bug in
Vinum.  Under certain circumstances, serious data corruption can

1.  You are using RAID-4 or RAID-5 plexes.
2.  One of these plexes (not the first plex in the system, whether a
    RAID-[45] plex or not) develops parity problems.
3.  You correct these errors with the 'rebuildparity' command.

Under these circumstances, the corrected blocks will probably be
written to the wrong subdisk.  The original parity errors will remain.
The fix is in 4-STABLE and 5-CURRENT (revisions and 1.29,
respectively).  I don't think that 3-STABLE currently supports the
rebuildparity command, but I shall check and MFC if necessary.

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