MySQL Active - Active Clustering

It is possible to use an active - active shared-disk cluster in MySQL in some cases. For doing this you have to fulfill the following requirements:

• Works with MyISAM tables only.
• POSIX-locking compliant cluster file system on the device (such as OCFS2 or GFS).
• External locking must be enabled.
• The MySQL query cache must be turned off.
• The MySQL delay key write must be turned off.
• OS where file locking is supported in MySQL.

Interested? To read more, follow the link: MySQL active - active Cluster (PDF 157 kbyte).

Related pages

• A very interesting comment from Peter Zaitsev you MUST read. He comments, why this set up you should NOT use: MySQL MyISAM Active Active Clustering - looking for trouble?
  And I do fully agree with him, that in 99% of all use cases this set up is not the right choice (and do not believe yours is the 1% :-))!
• The MySQL architecture stack