Mark,
Lustre 2.1 runs on the following kernels:
2.1.0 runs on 2.6.32-131
2.1.1 and 2.1.2 on 2.6.32-220
2.1.3 and 2.1.4 on 2.6.32-279
More information can be found on the 2.1 change log at
http://wiki.whamcloud.com/display/PUB/Changelog+2.1
Installation documentation can be found at
http://wiki.whamcloud.com/display/PUB/Putting+together+a+Lustre+filesystem and in the
Lustre manual at
http://wiki.whamcloud.com/display/PUB/Documentation
Hope this helps,
James