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List:       ssic-linux-users
Subject:    [SSI-users] Re: openSSI webView 0.1 released!
From:       "Brian J. Watson" <Brian.J.Watson () hp ! com>
Date:       2004-10-29 21:09:53
Message-ID: 4182B1A1.5060600 () hp ! com
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Kilian CAVALOTTI wrote:
> Hi all,
> 
> I'm very proud to announce here the release of the first web monitoring tool 
> for openSSI clusters. 

Friggin' beautiful!! Your utility looks like a nice enhancement to 
OpenSSI clustering!

One suggestion I have is to not separate the nodes into master and 
slaves. A master/slave architecture implies that the master is a single 
point of failure, which is not true in OpenSSI. It's better to call it 
the "init node". I see you use this term in one of your detail views.

Another problem with the master/slave connotation is that OpenSSI is a 
very peer-to-peer architecture. If a process on node 15 migrates to node 
37, but still has a socket on node 15, it will talk directly to node 15 
whenever it needs to access that socket. It doesn't need to go through 
the init node to do this. Same thing if it needs to access a file system 
served by node 22, or any other object that might be located anywhere in 
the cluster.

One last problem is that master/slave could imply that only the master 
node has a terminal, as in a Beowulf cluster. As we all know, this is 
definitely not the case with OpenSSI.

I think the master/slave perception of OpenSSI might come from the 
occasional use of the term "CLMS master node" as a synonym for the init 
node. This refers to a HA master/slave architecture in a small piece of 
OpenSSI: the CLuster Membership Subsystem (CLMS), which keeps track of 
who's in the cluster at any given time. When I originally wrote the 
documentation, I used this term because we hadn't yet thought of "init 
node". Now that we have, "CLMS master node" has been mostly purged from 
the documentation, since it's too technical and obscure to be meaningful 
to most users.

Thanks for the great work!

Brian



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