MySQL启动失败[ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

磁盘挂载不正确导致的主库启动不起来：

Recovery process statistics

  Checked pages by doublewrite buffer: 128

  Overwritten pages from doublewrite:  0

  Recovered pages by io_thread:        143

  Recovered pages by main thread:      0

  Parsed log records to apply:        139463

            Sum of the length:        964413

  Applied log records:                135257

            Sum of the length:        940059

  Pages which are already new enough:  128 (It may not be accurate, if turns > 1)

  Oldest page's LSN:                  39274

  Newest page's LSN:                  1597908

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171205 10:04:01  InnoDB: Operating system error number 2 in a file operation.

InnoDB: The error means the system cannot find the path specified.

InnoDB: cannot open ib_lru_dump

171205 10:04:01  InnoDB: Waiting for the background threads to start

171205 10:04:02 Percona XtraDB (http://www.percona.com) 1.1.8-rel24.1 started; log sequence number 1597915

171205 10:04:02 [Note] Recovering after a crash using /home/mysql/binlog

171205 10:04:02 [Note] Starting crash recovery...

171205 10:04:02 [Note] Crash recovery finished.

171205 10:04:02 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

171205 10:04:02 mysqld_safe mysqld from pid file /home/mysql/mysql.pid ended

解决：

1、查看分区UUID    blkid

2、查看/etc/fstatb文件挂盘文件是否正确

3、重新挂载分区，写入fstab文件