May 10, 201313 yr Below you can find a smart report of my WD 2TB EARS (= parity) after parity rebuild. Before the rebuild I had pending sector count = 84. Now this is reset to 0 but I have other things showing now: Offline_Uncorrectable = 18 Multi_Zone_Error_Rate = 86 The drive is 2 and a half years old, is this behavior to be expected? Or should I think about replacing the drive ? smartctl 5.39.1 2010-01-28 r3054 [i486-slackware-linux-gnu] (local build) Copyright © 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net === START OF INFORMATION SECTION === Device Model: WDC WD20EARS-00MVWB0 Serial Number: WD-WMAZA2791546 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: Fri May 10 20:00:59 2013 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: (0x84) Offline data collection activity was suspended by an interrupting command from host. 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: (37080) 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 200 200 051 Pre-fail Always - 1 3 Spin_Up_Time 0x0027 223 185 021 Pre-fail Always - 3841 4 Start_Stop_Count 0x0032 099 099 000 Old_age Always - 1334 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 095 095 000 Old_age Always - 3806 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 100 100 000 Old_age Always - 756 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 39 193 Load_Cycle_Count 0x0032 198 198 000 Old_age Always - 6635 194 Temperature_Celsius 0x0022 112 105 000 Old_age Always - 38 196 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 200 200 000 Old_age Offline - 18 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 86 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.
May 10, 201313 yr While the SMART = PASSED means that it still passes the manufacturer's thresholds, the number of reallocated sectors is something you should watch carefully. If that continues to grow, I'd replace the drive. I believe the 18 "Offline Uncorrectable" simply means there are 18 sectors that were defective, and couldn't be read when it reallocated those to spares. Whether or not you lost any data in the process depends on whether there was in fact data in them when SMART recognized the failure and did the reallocation ... and if so, whether or not UnRAID re-wrote the sector (it would have if there was a reported read error ... and the write should have resolved it, since it would then be to a reallocated sector). If the drive isn't reporting errors; and the parity check was good (0 errors); then I'd simply keep using the drive, but track the reallocated sector count. However, I'd certainly keep a spare drive handy
May 13, 201313 yr While the SMART = PASSED means that it still passes the manufacturer's thresholds, the number of reallocated sectors is something you should watch carefully. If that continues to grow, I'd replace the drive. I believe the 18 "Offline Uncorrectable" simply means there are 18 sectors that were defective, and couldn't be read when it reallocated those to spares. Whether or not you lost any data in the process depends on whether there was in fact data in them when SMART recognized the failure and did the reallocation ... and if so, whether or not UnRAID re-wrote the sector (it would have if there was a reported read error ... and the write should have resolved it, since it would then be to a reallocated sector). If the drive isn't reporting errors; and the parity check was good (0 errors); then I'd simply keep using the drive, but track the reallocated sector count. However, I'd certainly keep a spare drive handy Since this is your parity drive, I would just rerun the parity check with the "correct any Parity-Check errors by writing the Parity disk with correct parity". This will confirm the current state of readable for all parity, it's just too easy.
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