把www目录挂载到独立分区后Mysql无法启动

180601 13:15:15 [Note] Plugin 'FEDERATED' is disabled.
/www/server/mysql/bin/mysqld: Table 'mysql.plugin' doesn't exist
180601 13:15:15 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
180601 13:15:15 InnoDB: The InnoDB memory heap is disabled
180601 13:15:15 InnoDB: Mutexes and rw_locks use GCC atomic builtins
180601 13:15:15 InnoDB: Compressed tables use zlib 1.2.7
180601 13:15:15 InnoDB: Using Linux native AIO
180601 13:15:15 InnoDB: Initializing buffer pool, size = 1.0G
180601 13:15:15 InnoDB: Completed initialization of buffer pool
180601 13:15:15  InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name /www/server/data/ibdata1
InnoDB: File operation call: 'create'.
InnoDB: Cannot continue operation.

我把sda分区挂到www目录下安装宝塔面板出现的问题。根目录太小装不下宝塔面板。我觉得是权限到问题，但是改了775权限，用户改为mysql.mysql好像也没什么用...要么清理一下mysql的安装位置重装mysql？还是直接yum装mysql？

执行./mysql_install_db --user=mysql --basedir=/www/server/mysql --datadir=/www/server/data/mysql之后

提示错误ERROR: 1  Can't create/write to file '/www/server/data/mysql/mysql/db.MYI' (Errcode: 13)
然后mysqld就退出了。是不是路径不对啊...

你这个mysql是已安装的还是新安装的？