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#1 2019-08-04 10:56:53

Humar
Member
Registered: 2013-09-13
Posts: 52

[SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

Hello!

So, this is kinda strange for me:

Half an hour ago, I tinkered a bit with a bash config and while inside vim it suddenly told me, that the filesystem was read only.

I didn't think too much and thought that maybe a previous update may have caused this, so I rebooted.

Much to my disdain I was dropped to a systemd rescue shell...

btrfs rescue super-recover -v /dev/sdd1 says the blocks are okay

btrfs check on the other hand says that the checksums don't match.

Running btrfs rescue chunk-recover right now.

What else can I do?

Did the hdd really die on me? How can I be sure?

edit: I aborted btrfs rescued chunk-recover and instead looked at the logs again. It turns out, the error message is a bit different than it used to be, but I got "recover log failed" (more or less), so I ran

btrfs rescue zero-log /dev/sdd1

and then mounted successfully with

mount -t btrfs -o recovery,ro /dev/sdd1 /home

next I'll try without ro, but first I'll make a backup of the few changes I did since the last one

Last edited by Humar (2019-08-07 07:01:42)

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#2 2019-08-04 11:32:04

Humar
Member
Registered: 2013-09-13
Posts: 52

Re: [SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

I was too eager, it's not solved... falls back to read only after boot sad

So how can I check that the HDD is really dead/has a hardware failure?

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#3 2019-08-04 11:48:29

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 7,071

Re: [SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

Run a long SMART check on the drive and post the results of

smartctl -a /dev/sdd

after the mentioned self check time has elapsed.

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#4 2019-08-04 11:52:38

Humar
Member
Registered: 2013-09-13
Posts: 52

Re: [SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

Thanks, the long one will take 386 minutes to complete, so I'll do a short one first

result of the short and conveyance one:

smartctl 7.0 2018-12-30 r4883 [x86_64-linux-5.2.5-arch1-1-ARCH] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD30EFRX-68EUZN0
Serial Number:    WD-WMC4N2945918
LU WWN Device Id: 5 0014ee 05928be18
Firmware Version: 82.00A82
User Capacity:    3,000,592,982,016 bytes [3.00 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:    Sun Aug  4 14:03:56 2019 CEST
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: 		(38460) 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: 	 ( 386) minutes.
Conveyance self-test routine
recommended polling time: 	 (   5) minutes.
SCT capabilities: 	       (0x703d)	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   200   200   051    Pre-fail  Always       -       2
  3 Spin_Up_Time            0x0027   178   171   021    Pre-fail  Always       -       6091
  4 Start_Stop_Count        0x0032   097   097   000    Old_age   Always       -       3275
  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   093   093   000    Old_age   Always       -       5674
 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   098   098   000    Old_age   Always       -       2933
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       112
193 Load_Cycle_Count        0x0032   199   199   000    Old_age   Always       -       4227
194 Temperature_Celsius     0x0022   121   110   000    Old_age   Always       -       29
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   100   253   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  Conveyance offline  Completed without error       00%      5674         -
# 2  Short offline       Completed without error       00%      5674         -
# 3  Extended offline    Aborted by host               90%      5674         -

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.

I must say though, I am not sure how to read the results - I mean there is a column saying "value" and one labeled "worst" and then there is one with "raw_value".

Value is often worst and raw_value is way over the top. But then if I run

smartctl -H /dev/sdd

output is:

smartctl 7.0 2018-12-30 r4883 [x86_64-linux-5.2.5-arch1-1-ARCH] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, [url=http://www.smartmontools.org]www.smartmontools.org[/url]

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

Last edited by Humar (2019-08-04 12:16:34)

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#5 2019-08-05 16:45:03

ratcheer
Member
Registered: 2011-10-09
Posts: 665

Re: [SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

By any chance, did you convert your btrfs from another filesystem type? If yes, you will need to delete the backup that was made of your original filesystem (you should save it somewhere else, first), then rebalance the btrfs.

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#6 2019-08-05 18:05:53

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 7,071

Re: [SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

The RAW_VALUE is what's important, aside from 2 read_errors the drive looks fine, though you might want to post an updated log after the long test has run.

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#7 2019-08-06 18:55:26

Humar
Member
Registered: 2013-09-13
Posts: 52

Re: [SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

Hey, no I did not convert it, it was btrfs since 2015. I formatted it and to my disdain fucked up my backup due to a very dumb error on my side (remember kids, mount backups as read only, especially if you do rsync --delete and have it mounted inside your home)

So, yes, I screwed this up big time and now my usb stick with the second backup is dying too... doesn't work on any of my laptops anymore, so yeah.

Luckily I could save some data, but I lost quite some projects.

On the bright side: I'll now quadruple my efforts to have sustainable backups, so I hope I learned my lesson.

Thanks everyone, it's "SOLVED"

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#8 2019-08-06 20:06:18

ratcheer
Member
Registered: 2011-10-09
Posts: 665

Re: [SOLVED] BTRFS /dev/sdd1 (/home) cannot be mounted anymore

Ok, please mark the thread as Solved.

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