WARNING: Your hard drive is failing
Device: /dev/sda [SAT], 8 Currently unreadable (pending) sectors
WARNING: Your hard drive is failing
Device: /dev/sda [SAT], 8 Offline uncorrectable sectors

# sudo smartctl -a /dev/sda
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SMART Error Log Version: 1
ATA Error Count: 25 (device log contains only the most recent five errors)
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Error 25 occurred at disk power-on lifetime: 6502 hours (270 days + 22 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 00 ff ff ff 0f  Error: UNC at LBA = 0x0fffffff = 268435455

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  25 00 08 ff ff ff ef 00  14d+16:54:04.035  READ DMA EXT
  27 00 00 00 00 00 e0 00  14d+16:54:04.031  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]
  ec 00 00 00 00 00 a0 00  14d+16:54:03.993  IDENTIFY DEVICE
  ef 03 45 00 00 00 a0 00  14d+16:54:03.990  SET FEATURES [Set transfer mode]
  27 00 00 00 00 00 e0 00  14d+16:54:03.990  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]
...
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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%      6410         1468496680
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2018-01-08  9:38:25 140666168350528 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2018-01-08  9:38:25 140666168350528 [Note] InnoDB: Completed initialization of buffer pool
2018-01-08  9:38:32 140666168350528 [ERROR] InnoDB: Tried to read 1048576 bytes at offset 2097152. Was only able to read 163840.
2018-01-08 09:38:32 7fef64ff1740  InnoDB: Operating system error number 5 in a file operation.
InnoDB: Error number 5 means 'Input/output error'.
InnoDB: Some operating system error numbers are described at
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/operating-system-error-codes.html
 InnoDB: Operation read to file /tmp/mariadb-10.1.14/storage/xtradb/os/os0file.cc and at line 3160
2018-01-08  9:38:32 140666168350528 [ERROR] InnoDB: File (unknown): 'read' returned OS error 205. Cannot continue operation
180108 09:38:32 mysqld_safe mysqld from pid file /usr/local/data/mysql/data/mysqld.pid ended