[Linux-cluster] New features/architecture ?

[Patrick Caulfield]

David Teigland wrote:
> 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


That's really only about CCS changes. For a (slightly out-of-date ) higher
level overview see:
http://sources.redhat.com/cluster/events/summit2005/pjc2005.sxi

It doesn't mention openais (at least not in a relevant context!) but it might
give some more idea as to what is going on.
-- 

patrick