Below is part of the output of "zpool status".  It seems that sdr is 
defective, it has a steadily increasing number of checksum errors.

Would the "resilvered 763M" part be about the 121 checksum errors?  If so does 
that mean each checksum error required resilvering on average 6M of data?

The kernel message log has NOTHING about this.  I'm used to Ext* and BTRFS 
which give kernel message log entries about filesystem errors.  Can ZFS be 
configured to give similar logging?

As an aside I've written a mon module for monitoring for such ZFS errors.  
I'll release it sometime soon.  But I'd be happy to give a version that's 
quite usable although not ready for full release to anyone who wants it.

status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
  scan: resilvered 763M in 0h0m with 0 errors on Thu Aug 18 14:48:53 2016

        NAME           STATE     READ WRITE CKSUM
        server         ONLINE       0     0     0
          raidz1-0     ONLINE       0     0     0
            sdj        ONLINE       0     0     0
            sdk        ONLINE       0     0     0
            sdl        ONLINE       0     0     0
            sdm        ONLINE       0     0     0
            sdn        ONLINE       0     0     0
            sdo        ONLINE       0     0     0
            sdp        ONLINE       0     0     0
            sdq        ONLINE       0     0     0
            sdr        ONLINE       0     0   121

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