Help about replace a disk with read error

[ztx]

I have a disk that smart long test reported read error, the pool state is online, status: One or more devices has experienced an unrecoverable error.
I read the documents, and there is a note:

A disk that is failing but has not completely failed can be replaced in place, without first removing it. Whether this is a good idea depends on the overall condition of the failing disk. A disk with a few newly-bad blocks that is otherwise functional can be left in place during the replacement to provide data redundancy. A drive that is experiencing continuous errors can actually slow down the replacement. In extreme cases, a disk with serious problems might spend so much time retrying failures that it could prevent the replacement resilvering from completing before another drive fails.

Is that mean I can put the new disk in another slot and just select replace without take the failed disk offline, or I should take the failed disk offline without removing, and then select replace disk?

Thanks!

 

[ztx]

zpool status:

Code:

 pool: pooldata
 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://illumos.org/msg/ZFS-8000-9P
  scan: resilvered 8.12M in 0 days 00:00:03 with 0 errors on Fri Apr  3 19:04:18 2020
config:

    NAME                                            STATE     READ WRITE CKSUM
    pooldata                                        ONLINE       0     0     0
      raidz2-0                                      ONLINE       0     0     0
        gptid/33405a38-0b7f-11ea-8325-d05099d2a824  ONLINE       0     0     0
        gptid/3458190d-0b7f-11ea-8325-d05099d2a824  ONLINE       0     0     0
        gptid/356fa286-0b7f-11ea-8325-d05099d2a824  ONLINE       0     0    20
        gptid/379fd9f2-0b7f-11ea-8325-d05099d2a824  ONLINE       0     0     0
        gptid/396043ef-0b7f-11ea-8325-d05099d2a824  ONLINE       0     0     0
        gptid/3adbfa6e-0b7f-11ea-8325-d05099d2a824  ONLINE       0     0     0

errors: No known data errors

smartctl result:

Code:

smartctl 7.0 2018-12-30 r4883 [FreeBSD 11.3-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Green
Device Model:     WDC WD40EZRX-00SPEB0
Serial Number:    WD-WCC4ECJVZ845
LU WWN Device Id: 5 0014ee 25ff37bf5
Firmware Version: 80.00A80
User Capacity:    4,000,787,030,016 bytes [4.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Sat Apr  4 10:26:36 2020 CST
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:      ( 121)    The previous self-test completed having
                    the read element of the test failed.
Total time to complete Offline 
data collection:         (52080) seconds.
Offline data collection
capabilities:              (0x7b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    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:      ( 521) minutes.
Conveyance self-test routine
recommended polling time:      (   5) minutes.
SCT capabilities:            (0x7035)    SCT Status 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   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   175   170   021    Pre-fail  Always       -       8225
  4 Start_Stop_Count        0x0032   093   093   000    Old_age   Always       -       7589
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   079   079   000    Old_age   Always       -       15513
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   097   097   000    Old_age   Always       -       3069
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       130
193 Load_Cycle_Count        0x0032   156   156   000    Old_age   Always       -       133677
194 Temperature_Celsius     0x0022   120   110   000    Old_age   Always       -       32
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       1

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed: read failure       90%     15499         453244432
# 2  Extended offline    Completed: read failure       90%     15432         453244432
# 3  Short offline       Completed without error       00%     15360         -
# 4  Short offline       Completed without error       00%     15192         -
# 5  Short offline       Completed without error       00%     15024         -
# 6  Short offline       Completed without error       00%     14858         -
# 7  Short offline       Completed without error       00%     14688         -
# 8  Short offline       Completed without error       00%     14521         -
# 9  Short offline       Completed without error       00%     14353         -
#10  Short offline       Completed without error       00%     14185         -
#11  Short offline       Completed without error       00%     14019         -
#12  Extended offline    Completed: read failure       90%     14005         453244432
#13  Extended offline    Completed: read failure       90%     13993         453244432
#14  Short offline       Completed without error       00%     13849         -
#15  Short offline       Completed without error       00%     13681         -
#16  Short offline       Completed without error       00%     13524         -
#17  Short offline       Completed without error       00%     13356         -
#18  Short offline       Completed without error       00%     13274         -
#19  Short offline       Completed without error       00%     13111         -
#20  Short offline       Completed without error       00%     12869         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    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.[/CODE】

 

[sretalla]

If you have the available slot/connection, you can keep the old disk online for the replace operation and it will go faster.

 

[danb35]

and it will go faster.

Maybe. You'll also retain whatever redundancy you have with the dying disk until the new disk is resilvered into the pool.

 

[ztx]

So It's safe to do steps in "Replacing Disks to Grow a Pool" section in the documents?

1. Connect the new, larger disk to the unused disk port or drive bay.
2. Go to Storage ➞ Pools.
3. Select the pool and click  (Settings) ➞ Status.
4. Select one of the old, smaller disks in the pool. Click  (Options) ➞ Replace. Choose the new disk as the replacement.

 

[ztx]

So It's safe to do steps in "Replacing Disks to Grow a Pool" section in the documents?

1. Connect the new, larger disk to the unused disk port or drive bay.
2. Go to Storage ➞ Pools.
3. Select the pool and click  (Settings) ➞ Status.
4. Select one of the old, smaller disks in the pool. Click  (Options) ➞ Replace. Choose the new disk as the replacement.

 

[sretalla]

So It's safe to do steps in "Replacing Disks to Grow a Pool" section in the documents?

Yes, go ahead.

 

[ztx]

Thanks all, The disk replaced successfully. :)