I'm wondering how to interpret what ZFS is telling me in regard to the errors 
being reported. 1 of my disks (in a 5 disc raidZ array) reports about 4-5 
write/read errors every few days. All 5 are directly connected to the 
motheboard SATA ports, no raid controller card in between.

How bad is it? Should I think about replacing the drive? (I imagine it will be 
difficult to get it RMAed when most OS's won't even realise its screwing up)

Or are these small enough not to bother with, and I should just keep zpool 
clearing and ignoring it until something major happens?

(As you might be able to tell, I'm new to Opensolaris/ZFS)

An example of my output
  pool: storage
 state: ONLINE
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'.
   see: http://www.sun.com/msg/ZFS-8000-9P
 scrub: resilver completed after 0h0m with 0 errors on Tue Oct 13 18:34:39 2009
config:

    NAME        STATE     READ WRITE CKSUM
    storage     ONLINE       0     0     0
      raidz1    ONLINE       0     0     0
        c7t0d0  ONLINE       0     0     0
        c8d1    ONLINE       0     4     0  2.60M resilvered
        c9d0    ONLINE       0     0     0
        c9d1    ONLINE       0     0     0
        c10d0   ONLINE       0     0     0
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