I had been copying data from my pool so that I could rebuild it with a different version so that I could go away from solaris 11 and to one that is portable between freebsd/openindia etc. it was copying at 20mb a sec the other day which is about all my desktop drive can handle writing from the network. suddently lastnight it went down to 1.4mb i ran zpool status today and got this.

   pool: store
   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
   scan: none requested
   config:

    NAME          STATE     READ WRITE CKSUM
    store         ONLINE       0     0     0
      raidz1-0    ONLINE       0     0     0
        c8t3d0p0  ONLINE       0     0     2
        c8t4d0p0  ONLINE       0     0    10
        c8t2d0p0  ONLINE       0     0     0

it is currently a 3 x1tb drive array. what tools would best be used to determine what the error was and which drive is failing.

per the admin doc

 The second section of the configuration output displays error statistics. These errors are divided into three categories:

READ – I/O errors occurred while issuing a read request.

WRITE – I/O errors occurred while issuing a write request.

CKSUM – Checksum errors. The device returned corrupted data as the result of a read request.

it was saying low counts could be any thing from a power flux to a disk event but gave no suggestions as to what tools to check and determine with.