Практический пример полезности zfs

  pool: Pool
 state: ONLINE
  scan: scrub in progress since Sat Feb  9 09:46:15 2013
        4.01T scanned out of 9.01T at 308M/s, 4h43m to go
        4K repaired, 44.48% done
config:

 NAME        STATE     READ WRITE CKSUM
 Pool        ONLINE       0     0     0
   raidz1-0  ONLINE       0     0     0
     ada6    ONLINE       0     0     0
     ada3    ONLINE       0     0     0
     ada2    ONLINE       0     0     0  (repairing)
     ada1    ONLINE       0     0     0
     ada4    ONLINE       0     0     0
     ada5    ONLINE       0     0     0

=== START OF INFORMATION SECTION ===
Model Family:     SAMSUNG SpinPoint F4 EG (AF)
Device Model:     SAMSUNG HD204UI
Serial Number:    S2H7JD1Z904896
LU WWN Device Id: 5 0024e9 00414e5b3
Firmware Version: 1AQ10001
User Capacity:    2,000,398,934,016 bytes [2.00 TB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    5400 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 6
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Sat Feb  9 13:36:29 2013 MSK

==> WARNING: Using smartmontools or hdparm with this
drive may result in data loss due to a firmware bug.
****** THIS DRIVE MAY OR MAY NOT BE AFFECTED! ******
Buggy and fixed firmware report same version number!
See the following web pages for details:
http://knowledge.seagate.com/articles/en_US/FAQ/223571en
http://sourceforge.net/apps/trac/smartmontools/wiki/SamsungF4EGBadBlocks

SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00) Offline data collection activity
     was never started.
     Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0) The previous self-test routine completed
     without error or no self-test has ever
     been run.
Total time to complete Offline
data collection:   (20520) seconds.
Offline data collection
capabilities:     (0x5b) SMART execute Offline immediate.
     Auto Offline data collection on/off support.
     Suspend Offline collection upon new
     command.
     Offline surface scan supported.
     Self-test supported.
     No Conveyance Self-test supported.
     Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
     power-saving mode.
     Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
     General Purpose Logging supported.
Short self-test routine
recommended polling time:   (   2) minutes.
Extended self-test routine
recommended polling time:   ( 342) minutes.
SCT capabilities:         (0x003f) SCT Status supported.
     SCT Error Recovery Control supported.
     SCT Feature Control supported.
     SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   100   100   051    Pre-fail  Always       -       6
  2 Throughput_Performance  0x0026   252   252   000    Old_age   Always       -       0
  3 Spin_Up_Time            0x0023   067   067   025    Pre-fail  Always       -       10050
  4 Start_Stop_Count        0x0032   097   097   000    Old_age   Always       -       3620
  5 Reallocated_Sector_Ct   0x0033   252   252   010    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   252   252   051    Old_age   Always       -       0
  8 Seek_Time_Performance   0x0024   252   252   015    Old_age   Offline      -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       7754
 10 Spin_Retry_Count        0x0032   252   252   051    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   252   252   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       179
181 Program_Fail_Cnt_Total  0x0022   100   100   000    Old_age   Always       -       25245
191 G-Sense_Error_Rate      0x0022   100   100   000    Old_age   Always       -       118
192 Power-Off_Retract_Count 0x0022   252   252   000    Old_age   Always       -       0
194 Temperature_Celsius     0x0002   058   044   000    Old_age   Always       -       42 (Min/Max 17/56)
195 Hardware_ECC_Recovered  0x003a   100   100   000    Old_age   Always       -       0
196 Reallocated_Event_Count 0x0032   252   252   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   252   252   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   252   252   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0036   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x002a   100   100   000    Old_age   Always       -       26
223 Load_Retry_Count        0x0032   252   252   000    Old_age   Always       -       0
225 Load_Cycle_Count        0x0032   095   095   000    Old_age   Always       -       52350

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]


SMART Selective self-test log data structure revision number 0
Note: revision number not 1 implies that no selective self-test has ever been run
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Completed [00% left] (0-65535)
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.