On Wed, 2010-12-08 at 13:24 +0100, Arne Brutschy wrote: > Hi all, Hi Arne,
> I noticed that the Lustre-provided kernel RPMs are not PAE enabled. You didn't mention which distro or which version of kernel, but probably that is moot anyway. > Did > someone do this already, and if yes where can I find them? If you mean binary RPMs supplied by Oracle, we supply kernels that aim to match the vendor's own kernels as much as we can and still have them work with Lustre. As you know, most distros have a number of kernel variants and some distros at least as I know, have separate x86 and x86-pae kernels. This is likely due to the performance penalty of PAE. Providing two x86 kernels, one with PAE and one without, gives users the choice of whether they want/need the performance penalty of running with >4G of ram on x86. We don't aim to build and test and distribute every kernel variant that the distros build as that exponentially increases the complexity (and reduces timeliness) of our releases. Instead we have decided to support a single (i.e. 32 bit) x86 kernel (which for most distros, I suspect is a non-PAE kernel due to the performance penalty) for i[3-6]86 and x86_64 kernels. I don't know if any official policy about this is in place but I think the general feeling about that decision is that if you really want to use >4GB of ram, you should be using the 64-bit (i.e. x86_64) kernel/operating system. In fact, I think most (if not every) one uses the x86_64 architecture and kernels on their servers as there is really no reason (that I can think of) to use x86 there. Cheers, b. _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
