[Linux-cluster] Kernel level clustering!

Ali Nazemian alinazemian at gmail.com
Tue Dec 16 10:37:07 UTC 2008

Thanks for ur reply.
I heard about it and i wanted to know is it worth or not.
It really helped.

On Tue, Dec 16, 2008 at 12:26 AM, Chrissie Caulfield <ccaulfie at redhat.com>wrote:

> Ali Nazemian wrote:
> > Hi every body,
> > Any body knows that what happened to C-Sharifi project that announce 1
> > year ago?! that was about implementing clustering management in kernel...
> > Cheers.
> I don't know about that particular project but I do know something about
> implementing clustering in the kernel (from RHEL4 cman) and generally
> it's a waste of time and energy. The cluster manager is not
> performance-critical enough and too complex to do sensibly in the kernel.
> Having all the infrastructure in the kernel simply makes developing and
> testing much much harder for no real gain. The performance-critical
> components (eg lock manager and filesystem) can still be in the kernel
> and leave the cluster manager in userspace where it can be easily
> managed and reconfigured - have you ever tried to get an XML parser into
> the kernel? No, me neither and I don't want to try ;-)
> About the only thing that a kernel-based cluster manager gains you is
> freedom from memory inversion problems in low memory situations as you
> can guarantee it is always in physical RAM, but even that isn't total as
> you still have to rely on the networking layers. And there are ways of
> locking userland process into memory anyway. They're not quite as
> effective as having it kernel-based but those aren't perfect either!
> Just my ha-penny's worth ...
> Chrissie
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