Two years ago I wrote a post (Seagate ST3000DM001-9YN166: A catastrophic disk) about massive failings of a Seagate hard drive model. One of them didn't even last 4 months and already failed.
Now to a good example. In March 2010 I ordered two Western Digital Caviar Blue (7200rpm, 500GB, SATA-II) and used them together as RAID-1 on a self-built NAS server.
Now, five years later, one of the two drives failed. After a runtime of about 40'000 hours. That's quite a good life time for a SATA hard drive being online 24/7!
Here's the smartctl output of the failing drive:
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Caviar Blue Serial ATA family
Device Model: WDC WD5000AAKS-00V1A0
Serial Number: XXXXXXXXXXXXX
Firmware Version: 05.01D05
User Capacity: 500,107,862,016 bytes
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Wed May 20 15:25:40 2015 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
[...]
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 - 0
3 Spin_Up_Time 0x0027 177 138 021 Pre-fail Always - 2150
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 88
5 Reallocated_Sector_Ct 0x0033 151 151 140 Pre-fail Always - 391
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 045 045 000 Old_age Always - 40361
10 Spin_Retry_Count 0x0032 100 253 000 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 - 84
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 29
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 56
194 Temperature_Celsius 0x0022 100 093 000 Old_age Always - 43
196 Reallocated_Event_Count 0x0032 001 001 000 Old_age Always - 359
197 Current_Pending_Sector 0x0032 001 001 000 Old_age Always - 32916
198 Offline_Uncorrectable 0x0030 199 194 000 Old_age Offline - 151
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 200 197 000 Old_age Offline - 13
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: read failure 90% 40174 919347518
As you can see, the drive first re-allocated defect sectors and has no spare sectors left anymore. Another 32k defect sectors are pending to be reallocated - well, that won't happen anymore ;-).
Thanks to the RAID-1 configured in the NAS, everything continues to work. However it is strange that mdadm didn't detect the drive as failed. Both disks seem to be active in /proc/mdstat. Might be because of the old and unpatched SLES11 from anno 2010 though.
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