Downgrade En 4.3 Et Mysql Ne D

Bonjour à tous,

Je viens de faire un downgrade sur mon serveur.

Ca a bien fonctionné mais j'ai un souci : mysql ne veut plus démarrer.... (suite a la deisnstallation de mariadb ?)

Du coup j'ai tenté un acces via phpmyadmin : error 2002

SQL ERROR [ mysqli ]

Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) [2002]

An sql error occurred while fetching this page. Please contact an administrator if this problem persists.

J'ai un restart à la main :

140318 11:52:44 mysqld_safe mysqld from pid file /tmp/mysqld.pid ended
140318 11:53:07 mysqld_safe Starting mysqld daemon with databases from /var/services/mysql
140318 11:53:07 [Note] Plugin 'FEDERATED' is disabled.
/usr/syno/mysql/libexec/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
140318 11:53:07 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
140318 11:53:07  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 ./ibdata1
InnoDB: File operation call: 'open'.
InnoDB: Cannot continue operation.
140318 11:53:07 mysqld_safe mysqld from pid file /tmp/mysqld.pid ended
140318 11:53:30 mysqld_safe Starting mysqld daemon with databases from /volume1/@database/mysql
140318 11:53:30 [Note] Plugin 'FEDERATED' is disabled.
/usr/syno/mysql/libexec/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
140318 11:53:30 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
140318 11:53:30  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 ./ibdata1
InnoDB: File operation call: 'open'.
InnoDB: Cannot continue operation.
140318 11:53:30 mysqld_safe mysqld from pid file /tmp/mysqld.pid ended

Comme mon downgrade était en 4.3-3810, j'ai tenté une maj en 4.3-3827 mais idem.

Que faire ?

EDIT :

Après plusieurs recherche, je vois que la version dans /usr/syno/etc.defaults/rc.d/S21mysql.sh et dans /volume1/@database/mysql/VERSION ne sont pas les mêmes.

Surement à cause de la maj en 5 ?

Modifié le 18 mars 201411 a par Lokomass