MySQL fails with tablespace on OCFS2

[Peter Steinbach]

I have set up an cluster with ocfs2 on top of drbd in primary/primary mode.

As long as the datadir is in /var/lib/mysql everything works fine.
But as soon as I put the datadir on the ocfs2 filesystem
/mnt/data/mysql
mysql fails with:
[Ubuntu] root@fs2:/etc# mysqld --safe-mode
090930 18:08:14 [Warning] Can't create test file /mnt/data/mysql/fs2.lower-test
090930 18:08:14 [Warning] Can't create test file /mnt/data/mysql/fs2.lower-test
090930 18:08:14 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.

When I temporarily login as user mysql and create the same file it works:
$ whoami
mysql
$ echo a >/mnt/data/mysql/fs2.lower-test
$ ls -al
-rw-r--r-- 1 mysql mysql 2 2009-09-30 19:15 fs2.lower-test

So the mysql message seems to be misleading.

Some more facts:
- still th same error if filesystem is unmounted on the other machine of the cluster
- O2CB_HEARTBEAT_THRESHOLD=31
- Ubuntu 8.043
- MySQL server is mysql-server 5.0.51a
- ocfs2-tools 1.3.9
- drbd8-utils 2:8.0.11-0

Has anybody experienced a similar problem? May it have to do with locking or Extended attributes?
I really need to have the table space on the cluster, that's the reason why we built this cluster.