Confusing smartd messages

[George Mitchell]

Every thirty minutes, smartd is telling me:

Device: /dev/ada1, 2 Currently unreadable (pending) sectors
Device: /dev/ada1, 2 Offline uncorrectable sectors

smartctl -a /dev/ada1 seems to be reassuring me that everything is
fine (SMART overall-health self-assessment test result: PASSED),
though it also says:

197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always
      -       2
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age
Offline      -       2

which sounds like it confirms the log message above.  The disk is
part of a zraid pool whose "zpool status" also says everything is
okay.  What's the recommended action at this point?     -- George

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