With lustre 2.6 so close to release it is time for a newer kernel status
update. In my testing the current master branch of lustre-release will
work on clients running up to 3.10 kernels. Also the needed patches to
update to the newer proc handling have been landed for server side support.
You should be able to build a lustre file system with the servers running a
3.10 kernel using a ZFS back end. Support for ldiskfs is being worked
on but it will be a while before it is ready for production. If you like
to use a 3.12 kernel for either clients or servers you will need on patch
from LU-5234:
http://review.whamcloud.com/#/c/10761
As a disclamier this work tho completed is not offically apart of
the Lustre support matrix. So don't use it for a production file system.
Testing is always most welcomed.