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 (https://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