Let me rephrase your question: can you start with a standalone and a
MySQL DB, and add more simulator servers running standalones [connected
to that same DB] to obtain a grid? The answer is yes -- that's a
serverless grid ("serverless" means that it runs without the Robust or
other resource server(s) in between the simulators and the DB server).
It doesn't work with the configuration that comes out-of-the-box for
standalones, but it's just a matter of changing a few connectors for
this configuration in the .inis.
I use use such configuration on my grids.
On 8/19/2011 6:28 PM, Guardian wrote:
This then leads to the question, can a standalone be changed over to grid?
If you use a mysql backend for the standalone, can it just be changed
over to grid in the configs?
On Sat, Aug 20, 2011 at 3:52 AM, Diva Canto <[email protected]
<mailto:[email protected]>> wrote:
See basic definitions here, which is the model that has been
guiding OpenSim development for a while:
http://opensimulator.org/wiki/Virtual_World_Model
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".
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:
http://opensimulator.org/wiki/Serverless_Grids -- that article is
outdated, but it explains the concept.
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].
On 8/19/2011 8:13 AM, Bob Wellman wrote:
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.
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.
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!
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.
Getting good clear terminology for mdes of operation defined now
would help a lot in future I think.
Like I say just my thoughts. Any one else have thoughts on this?
> Date: Fri, 19 Aug 2011 11:11:25 +0100
> From: [email protected]
<mailto:[email protected]>
> To: [email protected]
<mailto:[email protected]>
> Subject: Re: [Opensim-users] Awaiting region handshake
>
> Thanks for the clarification Diva, me jumping in too quickly I
guess.
>
> I didn't think a standalone accepted region registration
requests from
> other opensim.exe's, but that you needed robust.exe to accept
> registrations from other opensim.exe's. I know that opensim.exe
> handles all the services when in standalone - but thought it
was "cut
> down" and didn't support external region registrations. I take
it from
> what you say it can do that? I've never even tried tbh.
>
> What you say about owners not supporting ad-hoc regions being
connected
> is of course true but that is a policy issue and enforced by
firewall
> rules. As far as I am aware robust.exe WILL accept a registration
> request from other opensim.exe's if the port to it is left open. Of
> course, I may well be wrong with that but when I asked about
this before
> (if there was any way to stop people registering with my grid -
I was
> told I had to block the port and that would be the way to do it).
>
> -----Original Message-----
> From: [email protected]
<mailto:[email protected]>
> [mailto:[email protected]] On Behalf Of
Diva Canto
> Sent: 18 August 2011 20:56
> To: [email protected]
<mailto:[email protected]>
> Subject: Re: [Opensim-users] Awaiting region handshake
>
> > I believe you can create as many regions as you like in a
standalone
> > but you are the only person that can go there I have created
both and
> > to have other ppl come to visit you need to be a grid
>
> This is not correct. Standalones can handle users from anywhere
in the
> world, as long as the routers are configured for that.
>
> > Basically, a standalone does not allow others to connect
their region
> > to your simulator, while a grid does. This has nothing to do
with
> > people visiting it.
>
> This is also not correct.
> Most grids are operated by one single organization/person and don't
> support the attachment of ad-hoc regions operated by others.
OSGrid is
> an exception in this respect.
>
> The difference between a standalone and a grid is simply the
number of
> components (usually hardware) involved. A standalone has all
services
> running in one single process in one single machine; a grid has
many
> simulator processes, usually on different machines, and it
typically
> centralizes resource management in yet other machine(s).
>
> So if you just want a small world with a few thousand objects
in world
> at any given time, stay with a standalone; if you plan to scale
up, look
> into the grid configuration.
>
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