Caonot change innodb_data_file_path (2 replies)

I just enabled innodb on a mysql server, and I am struggling with this variable that I cannot set without crashing the server.

All work well with the default value
innodb_data_file_path = ibdata1:10M:autoextend

If I change the size to say 100M, innodb dies and I get this kind of log :
(note that this one succeded at staeting, but momst of the time, Mysql dies definitely)

Nov 24 15:01:16 ns mysqld_safe: mysqld from pid file /var/run/mysqld/mysqld.pid ended
Nov 24 15:01:19 ns mysqld_safe: Starting mysqld daemon with databases from /home/mysql
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [Warning] '--log_slow_queries' is deprecated and will be removed in a future release. Please use ''--slow_query_log'/'--slow_query_log_file'' instead.
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [Note] Plugin 'FEDERATED' is disabled.
Nov 24 15:01:19 ns mysqld: InnoDB: The InnoDB memory heap is disabled
Nov 24 15:01:19 ns mysqld: InnoDB: Mutexes and rw_locks use GCC atomic builtins
Nov 24 15:01:19 ns mysqld: InnoDB: Compressed tables use zlib 1.2.3.3
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 InnoDB: Initializing buffer pool, size = 6.0G
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 InnoDB: Completed initialization of buffer pool
Nov 24 15:01:19 ns mysqld: InnoDB: Error: auto-extending data file ./ibdata1 is of a different size
Nov 24 15:01:19 ns mysqld: InnoDB: 640 pages (rounded down to MB) than specified in the .cnf file:
Nov 24 15:01:19 ns mysqld: InnoDB: initial 6400 pages, max 0 (relevant if non-zero) pages!
Nov 24 15:01:19 ns mysqld: InnoDB: Could not open or create data files.
Nov 24 15:01:19 ns mysqld: InnoDB: If you tried to add new data files, and it failed here,
Nov 24 15:01:19 ns mysqld: InnoDB: you should now edit innodb_data_file_path in my.cnf back
Nov 24 15:01:19 ns mysqld: InnoDB: to what it was, and remove the new ibdata files InnoDB created
Nov 24 15:01:19 ns mysqld: InnoDB: in this failed attempt. InnoDB only wrote those files full of
Nov 24 15:01:19 ns mysqld: InnoDB: zeros, but did not yet use them in any way. But be careful: do not
Nov 24 15:01:19 ns mysqld: InnoDB: remove old data files which contain your precious data!
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [ERROR] Plugin 'InnoDB' init function returned error.
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [Warning] Found an entry in the 'db' table with empty database name; Skipped
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [Warning] Found an entry in the 'db' table with empty database name; Skipped
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [Note] Event Scheduler: Loaded 0 events
Nov 24 15:01:19 ns mysqld: 121124 15:01:19 [Note] /usr/sbin/mysqld: ready for connections.
Nov 24 15:01:19 ns mysqld: Version: '5.1.58-1~dotdeb.0-log' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Debian)
Nov 24 15:01:20 ns /etc/mysql/debian-start[17941]: Upgrading MySQL tables if necessary.
Nov 24 15:01:20 ns /etc/mysql/debian-start[17944]: /usr/bin/mysql_upgrade: the '--basedir' option is always ignored
Nov 24 15:01:20 ns /etc/mysql/debian-start[17944]: Looking for 'mysql' as: /usr/bin/mysql
Nov 24 15:01:20 ns /etc/mysql/debian-start[17944]: Looking for 'mysqlcheck' as: /usr/bin/mysqlcheck
Nov 24 15:01:20 ns /etc/mysql/debian-start[17944]: This installation of MySQL is already upgraded to 5.1.58, use --force if you still need to run mysql_upgrade
Nov 24 15:01:20 ns /etc/mysql/debian-start[17951]: Checking for insecure root accounts.
Nov 24 15:01:20 ns /etc/mysql/debian-start[17955]: Triggering myisam-recover for all MyISAM tables


I tried to delete all ib_log_file and ibdata files, but it did not help - the only working setting is the default one.

Thanks for help