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dtrace -qn '
  BEGIN {
    state[0] = "SD_READY_VALID"; /* normal case, we ignore it */
    state[1] = "SD_NOT_READY_VALID"; /* no label, but valid device? */
    state[2] = "SD_RESERVED_BY_OTHERS"; /* reservation conflict */
  }
  ::sd_ready_and_valid:entry {
    self->un = args[0]->ssc_un;
  }
  /* 
   * If this is a case where function returns a non-zero value, we are dealing
   * with a device which is not ready in some form. This could be a device which
   * was removed from the system physically, or had power cut to the bay, or is
   * in some faulted state and .
   */
  ::sd_ready_and_valid:return /args[1] != 0/ {
    this->devptr = 
      (struct dev_info *)self->un->un_sd->sd_dev; /* dev_info structure */
    this->inq = self->un->un_sd->sd_inq; /* device inquiry structure */
    this->pid = stringof(this->inq->inq_pid); /* no printed atm */
    this->vid = stringof(this->inq->inq_vid);
    this->serial = stringof(this->inq->inq_serial);
    this->devn = stringof(this->devptr->devi_devid_str);
    this->rc = state[args[1]];

    printf("%s %s %s %s\n",
    this->devn, this->vid, this->serial, this->rc);
  }'

dtrace -qn '
  /* 
   * All Reads and Writes go through this function, so it is a convenient
   * place to measure how much of the data resulted in an error being raised.
   */
  BEGIN { start = timestamp ; }
  ::bioerror:entry /args[0]->b_flags&B_READ
  && (args[0]->b_flags&B_ERROR || args[0]->b_error != NULL)/ {
    printf("[R] Offset: %d Device: %d Error: %d\n",
            args[0]->b_offset, args[0]->b_edev, args[0]->b_error) ;
    @rerrkb = sum(args[0]->b_bcount >> 10) ;
  }
  ::bioerror:entry /args[0]->b_flags&B_WRITE
  && (args[0]->b_flags&B_ERROR || args[0]->b_error != NULL)/ {
  printf("[W] Offset: %d Device: %d Error: %d\n",
          args[0]->b_offset, args[0]->b_edev, args[0]->b_error) ;
    @werrkb = sum(args[0]->b_bcount >> 10) ;
  }
  END {
    printa("RerrKB: %@d WerrKB: %@d\n", @rerrkb, @werrkb) ;
    exit(0) ;
  }'