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See basic definitions here, which is the model that has been guiding
OpenSim development for a while:<br>
<a class="moz-txt-link-freetext" href="http://opensimulator.org/wiki/Virtual_World_Model">http://opensimulator.org/wiki/Virtual_World_Model</a><br>
<br>
In principle, the concept of grid is orthogonal to the concept of
simulator trust domain. In practice, and in the vast majority of
cases, they are unified (i.e. 1 grid = 1 trust domain), but in a few
but famous cases, they aren't -- that's the case of OSGrid, which is
a grid with several simulator trust domains in it. If the concept of
"simulator trust domain" is too abstract, substitute the expression
"multiple simulator trust domains" by "connecting someone else's
simulator to a grid".<br>
<br>
Technically, what makes a grid being a grid is having multiple
simulator servers serving different portions of the virtual space,
instead of just one simulator server -- that's all. One can run a
grid with an external resource server (Robust, Simian) or without,
using only simulator servers and a shared DB; the latter
configuration is what I call serverless grids:
<a class="moz-txt-link-freetext" href="http://opensimulator.org/wiki/Serverless_Grids">http://opensimulator.org/wiki/Serverless_Grids</a> -- that article is
outdated, but it explains the concept.<br>
<br>
When there are multiple simulators (=grid), whether the simulators
are operated by the same authority or decentralized by several
authorities is a different issue. For example, the Avination grid
and the SL grid are each operated entirely by one authority; the
OSGrid grid is operated by a multitude of authorities [that must
implicitly trust each other at the moment].<br>
<br>
<br>
On 8/19/2011 8:13 AM, Bob Wellman wrote:
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I have run Opensim both standalone as standalone and for the
last three years PMgrid in grid mode so I understand the
differences very well. <br>
<br>
However I can see where newcommers get confused when we talk
about grids beings a collection of regions and then use the term
"grid mode" to mean running using several servers or service
instances in collaberation to run a grid.<br>
<br>
I have often wondered if it wouldnt be better to coin a
different term for what we currently call grid mode to avoid
confusion. Maybe we could use Cooperative mode or Multi Service
mode or Distributed mode to describe the alternative mode to
Standalone. Something that better decribes the mode of operation
rather than "grid" which I think should be used just to describe
the region arrangement. Just a thought! <br>
<br>
When Intels DSG work hits mainstream (soon I hope) we will need
to distinguish grids that run using the current central
Robust.exe(s) and one or more Opensim.exe instances (i.e. what
we now call "Grid mode") to those that run the new even more
Distrubuted services provided by DSG. <br>
<br>
Getting good clear terminology for mdes of operation defined now
would help a lot in future I think.<br>
<br>
Like I say just my thoughts. Any one else have thoughts on this?<br>
<br>
<br>
<br>
<div>
> Date: Fri, 19 Aug 2011 11:11:25 +0100<br>
> From: <a class="moz-txt-link-abbreviated" href="mailto:t.gildersleeve@bradfordcollege.ac.uk">t.gildersleeve@bradfordcollege.ac.uk</a><br>
> To: <a class="moz-txt-link-abbreviated" href="mailto:opensim-users@lists.berlios.de">opensim-users@lists.berlios.de</a><br>
> Subject: Re: [Opensim-users] Awaiting region handshake<br>
> <br>
> Thanks for the clarification Diva, me jumping in too
quickly I guess. <br>
> <br>
> I didn't think a standalone accepted region registration
requests from<br>
> other opensim.exe's, but that you needed robust.exe to
accept<br>
> registrations from other opensim.exe's. I know that
opensim.exe<br>
> handles all the services when in standalone - but thought
it was "cut<br>
> down" and didn't support external region registrations. I
take it from<br>
> what you say it can do that? I've never even tried tbh.<br>
> <br>
> What you say about owners not supporting ad-hoc regions
being connected<br>
> is of course true but that is a policy issue and enforced
by firewall<br>
> rules. As far as I am aware robust.exe WILL accept a
registration<br>
> request from other opensim.exe's if the port to it is
left open. Of<br>
> course, I may well be wrong with that but when I asked
about this before<br>
> (if there was any way to stop people registering with my
grid - I was<br>
> told I had to block the port and that would be the way to
do it). <br>
> <br>
> -----Original Message-----<br>
> From: <a class="moz-txt-link-abbreviated" href="mailto:opensim-users-bounces@lists.berlios.de">opensim-users-bounces@lists.berlios.de</a><br>
> [<a class="moz-txt-link-freetext" href="mailto:opensim-users-bounces@lists.berlios.de">mailto:opensim-users-bounces@lists.berlios.de</a>] On Behalf
Of Diva Canto<br>
> Sent: 18 August 2011 20:56<br>
> To: <a class="moz-txt-link-abbreviated" href="mailto:opensim-users@lists.berlios.de">opensim-users@lists.berlios.de</a><br>
> Subject: Re: [Opensim-users] Awaiting region handshake<br>
> <br>
> > I believe you can create as many regions as you like
in a standalone <br>
> > but you are the only person that can go there I have
created both and <br>
> > to have other ppl come to visit you need to be a
grid<br>
> <br>
> This is not correct. Standalones can handle users from
anywhere in the<br>
> world, as long as the routers are configured for that.<br>
> <br>
> > Basically, a standalone does not allow others to
connect their region <br>
> > to your simulator, while a grid does. This has
nothing to do with <br>
> > people visiting it.<br>
> <br>
> This is also not correct.<br>
> Most grids are operated by one single organization/person
and don't<br>
> support the attachment of ad-hoc regions operated by
others. OSGrid is<br>
> an exception in this respect.<br>
> <br>
> The difference between a standalone and a grid is simply
the number of<br>
> components (usually hardware) involved. A standalone has
all services<br>
> running in one single process in one single machine; a
grid has many<br>
> simulator processes, usually on different machines, and
it typically<br>
> centralizes resource management in yet other machine(s).<br>
> <br>
> So if you just want a small world with a few thousand
objects in world<br>
> at any given time, stay with a standalone; if you plan to
scale up, look<br>
> into the grid configuration.<br>
> <br>
> _______________________________________________<br>
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