On Tue, Nov 18, 2014 at 09:29:54AM +0200, Brendan Hide wrote: > Hey, guys > > See further below extracted output from a daily scrub showing csum > errors on sdb, part of a raid1 btrfs. Looking back, it has been > getting errors like this for a few days now. > > The disk is patently unreliable but smartctl's output implies there > are no issues. Is this somehow standard faire for S.M.A.R.T. output? > > Here are (I think) the important bits of the smartctl output for > $(smartctl -a /dev/sdb) (the full results are attached): > ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED > WHEN_FAILED RAW_VALUE > 1 Raw_Read_Error_Rate 0x000f 100 253 006 Pre-fail > Always - 0 > 5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail > Always - 1 > 7 Seek_Error_Rate 0x000f 086 060 030 Pre-fail > Always - 440801014 > 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 200 200 000 Old_age > Always - 0 > 200 Multi_Zone_Error_Rate 0x0000 100 253 000 Old_age > Offline - 0 > 202 Data_Address_Mark_Errs 0x0032 100 253 000 Old_age > Always - 0
You have one reallocated sector, so the drive has lost some data at some time in the last 49000(!) hours. Normally reallocations happen during writes so the data that was "lost" was data you were in the process of overwriting anyway; however, the reallocated sector count could also be a sign of deteriorating drive integrity. In /var/lib/smartmontools there might be a csv file with logged error attribute data that you could use to figure out whether that reallocation was recent. I also notice you are not running regular SMART self-tests (e.g. by smartctl -t long) and the last (and first, and only!) self-test the drive ran was ~12000 hours ago. That means most of your SMART data is about 18 months old. The drive won't know about sectors that went bad in the last year and a half unless the host happens to stumble across them during a read. The drive is over five years old in operating hours alone. It is probably so fragile now that it will break if you try to move it. > > > -------- Original Message -------- > Subject: Cron <root@watricky> /usr/local/sbin/btrfs-scrub-all > Date: Tue, 18 Nov 2014 04:19:12 +0200 > From: (Cron Daemon) <root@watricky> > To: brendan@watricky > > > > WARNING: errors detected during scrubbing, corrected. > [snip] > scrub device /dev/sdb2 (id 2) done > scrub started at Tue Nov 18 03:22:58 2014 and finished after 2682 > seconds > total bytes scrubbed: 189.49GiB with 5420 errors > error details: read=5 csum=5415 > corrected errors: 5420, uncorrectable errors: 0, unverified errors: 164 That seems a little off. If there were 5 read errors, I'd expect the drive to have errors in the SMART error log. Checksum errors could just as easily be a btrfs bug or a RAM/CPU problem. There have been a number of fixes to csums in btrfs pulled into the kernel recently, and I've retired two five-year-old computers this summer due to RAM/CPU failures. > [snip] > > smartctl 6.3 2014-07-26 r3976 [x86_64-linux-3.17.2-1-ARCH] (local build) > Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org > > === START OF INFORMATION SECTION === > Model Family: Seagate Barracuda 7200.10 > Device Model: ST3250410AS > Serial Number: 6RYF5NP7 > Firmware Version: 4.AAA > User Capacity: 250,059,350,016 bytes [250 GB] > Sector Size: 512 bytes logical/physical > Device is: In smartctl database [for details use: -P show] > ATA Version is: ATA/ATAPI-7 (minor revision not indicated) > Local Time is: Tue Nov 18 09:16:03 2014 SAST > 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 > See vendor-specific Attribute list for marginal Attributes. > > 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: ( 430) 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: ( 1) minutes. > Extended self-test routine > recommended polling time: ( 64) minutes. > SCT capabilities: (0x0001) 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 100 253 006 Pre-fail Always > - 0 > 3 Spin_Up_Time 0x0003 099 097 000 Pre-fail Always > - 0 > 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always > - 68 > 5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always > - 1 > 7 Seek_Error_Rate 0x000f 086 060 030 Pre-fail Always > - 440801057 > 9 Power_On_Hours 0x0032 044 044 000 Old_age Always > - 49106 > 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always > - 0 > 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always > - 89 > 187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always > - 0 > 189 High_Fly_Writes 0x003a 098 098 000 Old_age Always > - 2 > 190 Airflow_Temperature_Cel 0x0022 060 030 045 Old_age Always > In_the_past 40 (Min/Max 23/70 #25) > 194 Temperature_Celsius 0x0022 040 070 000 Old_age Always > - 40 (0 23 0 0 0) > 195 Hardware_ECC_Recovered 0x001a 069 055 000 Old_age Always > - 126632051 > 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 200 200 000 Old_age Always > - 0 > 200 Multi_Zone_Error_Rate 0x0000 100 253 000 Old_age Offline > - 0 > 202 Data_Address_Mark_Errs 0x0032 100 253 000 Old_age Always > - 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% 37598 - > > 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. >
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