Re: [sdd] [glossary] topology definition

[James Falkner <james.falkner@sun.com>]

IMO There are three ways to use "topology".  Here are three examples
illustrating how I think we mean to use topology:


----

1. LOGICAL SOLUTION TOPOLOGY

My solution consists of a J2EE web app backed by a database.

2. PHYSICAL SOLUTION TOPOLOGY

I just finished deploying a solution.  Its topology is
J2EE container on host1, hosting a POS [point-of-sale :)]
app, and an RDBMS on host2 containing order information.

3. TARGET ENVIRONMENT TOPOLOGY

My datacenter's topology consists of 5 subnets with
25 hosts on each, each subnet has 5 Dell PCs, 10
HP opterons, and 15 Sun ultra 20's.

----


The difference is that the LOGICAL SOLUTION TOPOLOGY refers
to an un-deployed solution's requirements.  The PHYSICAL
SOLUTION TOPLOGY is the resulting topology of hosts that
were used in deployment of the solution.

In my opinion, #3 above is the traditional definition of the word,
and I do not believe that it makes sense for SDD to use it.  I think
continuing to use the word "topology" will confuse folks familiar with
the traditional meaning, and therefore I think we need to pick a new
word to mean a combination of #1 and #2 (or simply prefix our chosen
word with logical/physical to indicate the type).  Here are some
examples of my thinking:

Target Environment
Target Horizon
Host Set
Target Set
Target Domain

I actually like the last one, but then we end up overloading the
word "domain" (which has meaning in the networking world also, like
topology).

Thoughts?

-jhf-


Danielson, Debra J wrote:
> wouldn't 2 instances installed on one physical node be considered 2
> logical nodes?
> 
> I disagree with this conclusion. 
> 
> 
> Regards,
> Debra
> 
> -----Original Message-----
> From: Jay Nash [mailto:jay@o-ms.com] 
> Sent: Thursday, March 16, 2006 10:08 AM
> To: sdd@lists.oasis-open.org
> Subject: [sdd] [glossary] topology definition
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Folks,
> Upon further review, the common use of the term 'topology' in the realm
> of computer science is
> 
> "The physical or logical layout of the nodes in a network".
> 
> If we mean to include the possibility of multiple instances on a single
> machine (or node), then we should consider using a word other than
> 'topology'.  Target environments, or target hosts seem reasonable.
> 
> Regards,
> Jay Nash
> - --
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