November 4, 201411 yr Just to preface, after reading many forum threads I am aware that I did not handle this troubleshoot process in the ideal way initially. Hoping for some guidance at my current point. So this started with noticing that my parity disk had thrown thousands of errors per the unraid main page. I had not run a parity check in a few weeks, and all previous parity checks have been error free. None of my 3 data drives at this point were showing any errors on the main page and everything was still green balled. I unfortunately decided to reboot without grabbing a syslog, then ran a parity check which was progressing at an incredibly slow pace. At this point I cancelled the parity check and I bought a new HDD to replace my failing parity drive. After performing the swap, I started the parity-sync which has now finished finding 7 errors, all of which are on disk3 (a 2TB drive that is about half-full with data). No other errors on any of the other drives. At this point, I assume there is no real way to determine if I suffered any data loss. Posted below is the syslog showing the errors during the parity-sync, as well as the SMART report for disk3. My best interpretation is that I probably did not suffer any data loss, but I should replace disk3 with a new drive and let my new parity disk rebuild it. Please advise, thanks! === START OF INFORMATION SECTION === Device Model: WDC WD20EARX-00PASB0 Serial Number: WD-WCAZAH474551 Firmware Version: 51.0AB51 User Capacity: 2,000,398,934,016 bytes Device is: Not in smartctl database [for details use: -P showall] ATA Version is: 8 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Mon Nov 3 20:49:25 2014 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: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. Self-test execution status: ( 113) The previous self-test completed having the read element of the test failed. Total time to complete Offline data collection: (38880) 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: ( 255) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SCT capabilities: (0x3035) 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 145 145 051 Pre-fail Always - 213849 3 Spin_Up_Time 0x0027 213 174 021 Pre-fail Always - 4316 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 810 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 37 7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0 9 Power_On_Hours 0x0032 080 080 000 Old_age Always - 15027 10 Spin_Retry_Count 0x0032 100 100 000 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 - 14 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 7 193 Load_Cycle_Count 0x0032 198 198 000 Old_age Always - 6107 194 Temperature_Celsius 0x0022 128 116 000 Old_age Always - 22 196 Reallocated_Event_Count 0x0032 192 192 000 Old_age Always - 8 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 1 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 128 113 000 Old_age Offline - 19442 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 Short offline Completed: read failure 10% 15024 1203316928 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. syslog.txt
November 4, 201411 yr There's a bad spot on the disk as defined by the LBA, I would try to get my data off that disk in any way possible, then do a preclear. You can possibly exercise the full drive with badblocks in readonly mode. You can possible try a smart long test. What has me curious us there is one off line uncorrectable sector, but no pending sectors. I'm not sure if the offline uncorrectable sector is where the LBA error is or there's a new spot that's causing issue. You can try the Western Digital utilities also. Once you do get your data safely off the drive, chances are a preclear should help clear or reallocate any bad spots. Watch the reallocated count. if that starts climbing fast and/or high, then the drive should be RMA'd.
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