>Is there any matrix published that can tell with OS/kernel/OFED(MOFED)/stacks are supported?
>My particular question is if  it possible to compile latest Lustre master branch  against Ubuntu 14, kernel-3.12 and MOFED-2.2

If you a talking about the latest master then yes it should be support. In fact we have support up to 3.14 kernels now. If you

plan to run ldiskfs you will need some additional patches. We have a patch for fedora which might work for you. See JIRA ticket

LU-4416 for more info.