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Lustre currently has two actively developed and maintained branches. These the are 1.8.x and 2.1 releases. Lustre 1.8.x is used in production environments around the world. It is mature and stable. Lustre 2.1 has is not yet ready for production, but it will introduct introduces SMP scaling enhancements to address the issues currently limiting Lustre’s use of more exploit machines with large numbers of sockets, cores and threads. The Lustre 2.1 release is scheduled to be released at the end of Q2, 2011.
The Metadata Server (MDS) is crucial to overall performance of the Lustre filesystem. Increasing memory on the MDS will increase the cache available and increase performance. It is common to see production MDS machines boast 24GB or 48GB per core.
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