The situation here isn't what's normally called "dual-licensed." The situation with Lustre is that old versions of the code are offered under GPL but the current version is not. CFS professes an intention to make all code available under GPL when it is no more than a year old.
"dual-licensed" means the very same code is offered under two different licenses at the same time. Some licensees will take it under GPL; others will take it under some other license. An example of why someone would want the non-GPL license is that he wants to extend it and ship object code only. But he probably has to pay money for that non-GPL license.
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