[Ocfs2-users] MySQL fails with tablespace on OCFS2

[Sunil Mushran]

You can try trapping the error in the fs.

Do:
# debugfs.ocfs2 -l NAMEI ENTRY on
# mysqld --safe-node
# debugfs.ocfs2 -l NAMEI off ENTRY deny

/var/log/messages will have the logs.


Peter P GMX wrote:
> 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 at 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 can
> create the file:
>   $ 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
>
> I've also tried with an ext3 filesystem on the drbd device in
> primary/secondary configuration, this worked fine.
> So this only happens when the datadir is on a ocfs2 file system.
>
> Some more facts:
> - still the 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've also asked on the Mysql users side as I do not know whether this is
> an OCFS or a MySQL problem.
>
> Best regards
> Peter
>
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