[Linux-cluster] New features/architecture ?

[David Teigland]

On Thu, Apr 20, 2006 at 07:46:24AM -0400, Kovacs, Corey J. wrote:
> I've worked with GFS 6 and 6.1 quite a bit lately and in reading the posts
> over the last few months, I see a lot
> of references to gfs2. I'm not quite sure where it sits in the grand scheme
> of things other than it's the next big
> itteration of gfs as a whole and attepmpts are being made to mearge it into
> the kernel. 
> 
> This post has some good info, but not much in the way of specifics
> http://lwn.net/Articles/150652/
> 
> *	GFS2 - an improved version of GFS, not on-disk compatible 
> *	DLM - an improved version of DLM 
> *	CMAN - a new version of CMAN, based on OpenAIS
> <http://developer.osdl.org/dev/openais/>  
> *	CLVM - will allow more LVM2 features to be used in the cluster
> 
> These seem to be all there is as far as a "roadmap" and the OpenAIS link
> doesn't seem all that descriptive
> unless one is a developer.
> 
> Is there some point of reference which describes the changes between whats
> already released and what is 
> planned? For instance, a post recently mentioned adding openais
> interfaces/functionality. 

For GFS2 and DLM it's largely performance improvements.  For clustering
infrastructure a ton of stuff moved out of the kernel and now runs in user
space, with openais at the center.  The user isn't exposed to much of the
infrastructure so there's not much user-visible change to speak about.

Patrick recently sent this out:
https://www.redhat.com/archives/linux-cluster/2006-April/msg00126.html

Dave