Hello,

Got a test server with version 5.5.20. I wanted to unmount/mount the disk
where the innodb files was located, so I did a shutdown followed by unmount,
then a mount before I tried to start the MySQL server. But it did not work as
shown in the log below.

I wanted to unmount the disk since I wanted to change the 'defaults'
in /etc/fstab with
'defaults,noatime,data=writeback,barrier=0,nobh,errors=remount-ro'.

What could cause this? Guess I have to recreate the files and start all over
again?

# Older message from the error file showing the version.
Version: '5.5.20-log' socket: '/tmp/mysql.sock' port: 3306 Source
distribution

# Shutdown messages
140114 18:14:53 [Note] Event Scheduler: Purging the queue. 0 events
140114 18:14:53 InnoDB: Starting shutdown...
140114 18:17:58 InnoDB: Shutdown completed; log sequence number 2230197670580
140114 18:17:58 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete

# Restart after umount/mount.
140114 18:17:59 mysqld_safe mysqld from pid
file /usr/local/mysql/data/hostname.pid ended
140114 18:20:05 mysqld_safe Starting mysqld daemon with databases
from /usr/local/mysql/data
140114 18:20:05 InnoDB: The InnoDB memory heap is disabled
140114 18:20:05 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140114 18:20:05 InnoDB: Compressed tables use zlib 1.2.5
140114 18:20:05 InnoDB: Initializing buffer pool, size = 25.0G
140114 18:20:08 InnoDB: Completed initialization of buffer pool
140114 18:20:08 InnoDB: Error: data file /data/mysql/data/ibdata3 uses page
size 1024,
140114 18:20:08 InnoDB: but the only supported page size in this release
is=16384
140114 18:20:08 InnoDB: Could not open or create data files.
140114 18:20:08 InnoDB: If you tried to add new data files, and it failed
here,
140114 18:20:08 InnoDB: you should now edit innodb_data_file_path in my.cnf
back
140114 18:20:08 InnoDB: to what it was, and remove the new ibdata files InnoDB
created
140114 18:20:08 InnoDB: in this failed attempt. InnoDB only wrote those files
full of
140114 18:20:08 InnoDB: zeros, but did not yet use them in any way. But be
careful: do not
140114 18:20:08 InnoDB: remove old data files which contain your precious
data!
140114 18:20:08 [ERROR] Plugin 'InnoDB' init function returned error.
140114 18:20:08 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE
failed.
140114 18:20:08 [ERROR] Unknown/unsupported storage engine: InnoDB
140114 18:20:08 [ERROR] Aborting

=2D-
J=F8rn Dahl-Stamnes
homepage: http://photo.dahl-stamnes.net/

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