BTRFS
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En un servidor configurat com a RAID 10 amb 4 discs durs, trobem un misstage a la pantalla que diu:
BTRFS error (device sda1): bdev /dev/sdf1 errs: wr 51956436, rd 28739183, flush 124601, corrupt 0, gen 0
Això ens diu que hi ha algun problema en el sistema d'arxius. Si fem algunes comprovacions:
sudo btrfs scrub start /media/btrfs/ scrub started on /media/btrfs/, fsid bb600f14-9fbb-4f27-af33-95c6ac1975fe (pid=16546)
sudo btrfs scrub status /media/btrfs/ scrub status for bb600f14-9fbb-4f27-af33-95c6ac1975fe scrub started at Mon Nov 18 13:54:43 2019, running for 00:15:05 total bytes scrubbed: 84.04GiB with 5340488 errors error details: read=5340485 super=3 corrected errors: 0, uncorrectable errors: 5340485, unverified errors: 0
Efectivament, es troben molts errors que no pot solucionar.
Si fem un smartctl al disc que sembla fallar:
sudo smartctl /dev/sdf -a
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.15.0-70-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Seagate Barracuda 7200.14 (AF)
Device Model: ST2000DM001-1ER164
Serial Number: W4Z19BCP
LU WWN Device Id: 5 000c50 07d44b288
Firmware Version: CC25
User Capacity: 2.000.398.934.016 bytes [2,00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is: Mon Nov 18 15:53:14 2019 UTC
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: (0x82) Offline data collection activity
was completed without error.
Auto Offline Data Collection: Enabled.
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: ( 89) 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: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 219) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x1085) SCT Status supported.
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 117 099 006 Pre-fail Always - 162249504
3 Spin_Up_Time 0x0003 100 096 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 175
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 079 060 030 Pre-fail Always - 89979761
9 Power_On_Hours 0x0032 081 081 000 Old_age Always - 16693
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 85
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
188 Command_Timeout 0x0032 100 089 000 Old_age Always - 1 2 12
189 High_Fly_Writes 0x003a 099 099 000 Old_age Always - 1
190 Airflow_Temperature_Cel 0x0022 064 048 045 Old_age Always - 36 (Min/Max 30/38)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 44
193 Load_Cycle_Count 0x0032 067 067 000 Old_age Always - 67287
194 Temperature_Celsius 0x0022 036 052 000 Old_age Always - 36 (0 9 0 0 0)
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 069 000 Old_age Always - 262
240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 16485h+48m+15.949s
241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 19632474908
242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 1261379460714
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 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.
Diu que no està molt sà, però que funciona. Per tant, cal intentar reparar el sistema d'arxius:
btrfs rescue zero-log /dev/sdf1 # Si és un error de transaccions tallades per un tall elèctric, per exemple. btrfs rescue super-recover # Si no està el superblock, el recupera de una de les còpies que té el disc. btrfs rescue chunk-recover # En cas de fallar les metadates i tindre fitxers desconeguts. És lent i perillós. btrfs check --repair /dev/sdXY # Per reparar el sistema d'arxius.