The problem is with latest MySQL update on Plesk 12.5.30.
They take it off from the repository list.
But when update from 12 directly to Plesk 12.5.30. the problem persist. After restart mysql failed to start.
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Starting MySQL database server mysqld [fail]
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InnoDB: Operating system error number 11 in a file operation.
InnoDB: Error number 11 means 'Resource temporarily unavailable'.
InnoDB: Some operating system error numbers are described at
InnoDB:
http://dev.mysql.com/doc/refman/5.5/en/operating-system-error-codes.html
151119 16:32:45 InnoDB: Could not open or create data files.
151119 16:32:45 InnoDB: If you tried to add new data files, and it failed here,
151119 16:32:45 InnoDB: you should now edit innodb_data_file_path in my.cnf back
151119 16:32:45 InnoDB: to what it was, and remove the new ibdata files InnoDB created
151119 16:32:45 InnoDB: in this failed attempt. InnoDB only wrote those files full of
151119 16:32:45 InnoDB: zeros, but did not yet use them in any way. But be careful: do not
151119 16:32:45 InnoDB: remove old data files which contain your precious data!
151119 16:32:45 [ERROR] Plugin 'InnoDB' init function returned error.
151119 16:32:45 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
151119 16:32:45 [ERROR] Unknown/unsupported storage engine: InnoDB
151119 16:32:45 [ERROR] Aborting
151119 16:32:45 [Note] /usr/sbin/mysqld: Shutdown complete
151119 16:32:45 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended