数据库是之前从另外的linux服务器拷过来的，当时拷了ibdata和数据库文件，经过加权，改路径，当时启动成功了。
用了一段时间，中间重启过几次，也没有问题，就没有去看mysql.err文件。
但是昨晚，重启后报错the server quit without updating pid,
这个问题之前遇到过，按着之前的方法试了，但是不行。
看错误日志 mysql.err，结果 好多一样的这个错误：
2015-09-10 15:36:29 5590 [Note] InnoDB: Memory barrier is not used
2015-09-10 15:36:29 5590 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-09-10 15:36:29 5590 [Note] InnoDB: Using Linux native AIO
2015-09-10 15:36:29 5590 [Note] InnoDB: Using CPU crc32 instructions
2015-09-10 15:36:29 5590 [Note] InnoDB: Initializing buffer pool, size = 6.0G
2015-09-10 15:36:29 5590 [Note] InnoDB: Completed initialization of buffer pool
2015-09-10 15:36:29 5590 [ERROR] InnoDB: ./ib_logfile0 can't be opened in read-write mode
2015-09-10 15:36:29 5590 [ERROR] Plugin 'InnoDB' init function returned error.
2015-09-10 15:36:29 5590 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2015-09-10 15:36:29 5590 [ERROR] Unknown/unsupported storage engine: InnoDB
2015-09-10 15:36:29 5590 [ERROR] Aborting
2015-09-10 15:36:29 5590 [Note] Binlog end
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'partition'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_METRICS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_CMPMEM'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_CMP'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_LOCKS'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'INNODB_TRX'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'BLACKHOLE'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'ARCHIVE'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'CSV'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'MEMORY'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'MRG_MYISAM'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'MyISAM'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'sha256_password'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'mysql_old_password'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'mysql_native_password'
2015-09-10 15:36:29 5590 [Note] Shutting down plugin 'binlog'
2015-09-10 15:36:29 5590 [Note] /usr/sbin/mysqld: Shutdown complete
150910 15:36:29 mysqld_safe mysqld from pid file /var/c/mysql/MySQLSlave.pid ended
