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Pool shows DEGRADED after Replace and Resilvering

Western Digital Drives - The Preferred Drives of FreeNAS and TrueNAS CORE

paulhaig

Neophyte
Joined
Dec 19, 2018
Messages
10
Hello FreeNas community,
I am hoping for some assistance recovering a DEGRADED pool after battling with it for a week or so.
I am running FreeNAS 11.3-U5 with 1 RaidZ2 pool 'PaulsPool' which has 6x2TB drives via LSI 9211-8i IT Mode.

Background:
This system has been online and working without error for approx 1 year.
Approximately 6 months ago the original pool was 6x1TB
to increase capacity I used similar steps as below (OFFLINE,REPLACE,RESILVER) to replace each drive with 2TB, one at a time after resilver was complete in each case.​
After migrating pool from 6x1TB to 6x2TB the pool has been working well.​
I am mentioning this in case it is relevant to my problem below.​

Problem:
Recently received an email alert that my pool was in a DEGRADED state.
  • I connected to FreeNAS web UI and found pool 'PaulsPool' drive /dev/da5 was reporting FAULTED
  • Attempting to run 'smartctrl -a /dev/da5' produced no results/output. (however provided expected results/output for other disks). I figured the disk was faulty.
  • using smartctrl -a I confirmed serial numbers for all other disks and determined the physical faulty disk.
  • I walked through the process of replacing the disk via https://www.ixsystems.com/documentation/freenas/11.3-U1/storage.html#replacing-a-failed-disk
    • I can not remember exactly but I do not think the disk switched to "OFFLINE" state, however I did not receive any popup/error when I performed this step prior to removing the disk.
    • In my subsequent re-attempts to resolve the DEGRADED pool I continue to try and OFFLINE the disk but it does not show any error but does not show OFFLINE state. It continues to show FAULTED.
    • I now use the cli and issue zpool clear PaulsPool /dev/da5 and this will set it OFFLINE
    • (perhaps these details are relevant to my problem)
  • I powered down system and replaced the 2TB drive with a new WD 4TB Red drive.
    • (I plan to eventually swap all the drives to 4TB once I can get this first FAULTED drive replaces successfully.)
  • I powered back up server and went through the "Replace" steps via Web GUI.
    • I confirmed that the drive offered for selection was in fact the new drive using smartctl -a to confirm serial number.
  • The "Replace" completed successfully and then the PaulsPool status showed "ONLINE" and there is a "RESILVER Status: Scanning" in progress
After a while during the resilver the pool then shows DEGRADED again showing WRITE errors?

root@freenas[~]# zpool status PaulsPool
pool: PaulsPool
state: DEGRADED
status: One or more devices are faulted in response to persistent errors.
Sufficient replicas exist for the pool to continue functioning in a
degraded state.
action: Replace the faulted device, or use 'zpool clear' to mark the device
repaired.
scan: scrub repaired 0 in 0 days 08:54:56 with 0 errors on Thu Jan 28 16:20:06 2021
config:

NAME STATE READ WRITE CKSUM
PaulsPool DEGRADED 0 0 0
raidz2-0 DEGRADED 0 0 0
gptid/b4eb0a09-32ce-11ea-a9e6-e0d55eb3168e ONLINE 0 0 0
gptid/a2831277-31a1-11ea-a9e6-e0d55eb3168e ONLINE 0 0 0
gptid/4efa46b9-3274-11ea-a9e6-e0d55eb3168e ONLINE 0 0 0
gptid/e7ac2c9b-320c-11ea-a9e6-e0d55eb3168e ONLINE 0 0 0
gptid/e303cb9c-609e-11eb-88c1-e0d55eb3168e FAULTED 0 449 0 too many errors
gptid/a60b2095-13b9-11e9-ba42-e0d55eb3168e ONLINE 0 0 0

errors: No known data errors
root@freenas[~]#


FreeNAS PaulsPool Status.PNG



However after I run an extended smartctl test and wait for it to complete I do not see any errors reported for the extended test?
Should I expect smartctl exteded test to align with reported FAULTED drive in FreeNAS?

root@freenas[~]# smartctl -a /dev/da5
smartctl 7.0 2018-12-30 r4883 [FreeBSD 11.3-RELEASE-p14 amd64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family: Western Digital Red (SMR)
Device Model: WDC WD40EFAX-68JH4N1
Serial Number: WD-WX12D80JSFNJ
LU WWN Device Id: 5 0014ee 2bde5ad25
Firmware Version: 83.00A83
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Thu Jan 28 13:02:53 2021 EST
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: (41160) 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: ( 153) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x3039) 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 100 253 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 100 253 021 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 2
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 100 100 000 Old_age Always - 85
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 2
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 0
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 1
194 Temperature_Celsius 0x0022 116 112 000 Old_age Always - 31
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 - 0

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 without error 00% 85 -
# 2 Extended offline Completed without error 00% 53 -
# 3 Conveyance offline Completed without error 00% 51 -

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.

root@freenas[~]#



For the drive that I am struggling to replace into the pool:
  • I have tried with 2 other new WD 4TB Red drives and I get same results as above?
  • I have tried a different sata port/cable
  • I have tried to bypass the LSI card and use motherboard onboard SATA port.
  • I am getting same results with slightly different number of WRITE errors each time during Resilvering.
Hoping to get the pool back into ONLINE state without having to revert to backup.
Is is possible I just have 3 bad 4TB Red Drives. (all ordered and arrived in the same package)?
Any guidance appreciated.
Thank you.

Regards,
Paul.
 

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Samuel Tai

Never underestimate your own stupidity
Moderator
Joined
Apr 24, 2020
Messages
3,606
Please confirm the model number of your WD Reds. If they're WD40EFAX, they're SMR drives which are known to interact badly with ZFS resilvering. If they're WD40EFRX, those are CMR drives which are known to work with ZFS, and you may have a controller issue.
 

Samuel Tai

Never underestimate your own stupidity
Moderator
Joined
Apr 24, 2020
Messages
3,606
For some education on why SMR drives are bad, see:

 

Jailer

Not strong, but bad
Joined
Sep 12, 2014
Messages
4,688
Also to add, if a drive is faulted it is offline already. There is no need to "offline" the drive via cli. In this case you would use the replace option from the GUI to replace the faulted drive and let it resilver.
 

paulhaig

Neophyte
Joined
Dec 19, 2018
Messages
10
Samuel,
Thank you for the prompt response.
My new 4TB drives are in fact WD40EFAX - SMR drives.
I will look to getting them replaced instead of trying to trying make them work via "Mitigating the DM-SMR issues with ZFS "

Jailer,
Thank you for your input. I won't stress when I can not "offline" the drive when it is already reported "FAULTED" :)

Regards,
Paul.
 

paulhaig

Neophyte
Joined
Dec 19, 2018
Messages
10
Update:
I have obtained 4TB - WD40EFRX and first drive has been REPLACED and RESILVERED successfully. No errors.
Thank you Samuel.
 
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