[Opensim-users] grid operation

Thu Dec 4 18:20:13 UTC 2008

Could someone please read
http://opensimulator.org/index.php?title=OpenSim:Introduction_and_Definitions
and fix any glaring errors or omissions I may have made?  There's a
couple of TODO items therein (at least one needs examination by people
familiar with Assets, Inventory, and how they're managed), and I'd
like to solicit feedback on how I can write these kinds of things
better.

-Kyle H

On Mon, Dec 1, 2008 at 12:42 AM, Stefan Andersson <stefan at tribalmedia.se> wrote:
> Really, if somebody would be so excellent as to take this whole thread, and
> out of the questions and answers on it, make a wiki page, called
> 'OpenSim:Introduction and Definitions' or something, that would be SO
> golden.
>
> You seldom get these opportunities to learn from noob confusion. This is an
> excellent thread.
>
> Best regards,
> Stefan Andersson
> Tribal Media AB
>
> Join the 3d web revolution : http://tribalnet.se/
>
>
>
>
>
>
> ________________________________
> Date: Sun, 30 Nov 2008 13:16:35 -0800
> From: diva at metaverseink.com
> To: opensim-users at lists.berlios.de
> Subject: Re: [Opensim-users] grid operation
>
> Yes, those are all functions of the 3D space service currently. Scripting
> and backend modules provide programmable behavior for the objects and agents
> in the 3D environment.
> The scripts are stored in the asset server, just like all other assets. They
> are brought in to the region when the region starts and run on the same
> process that runs the region. When you create a new script in a region, that
> script is cached in that region's asset cache (in memory), and is sent to
> the asset server for persistent storage.
>
> This is the current architecture. I remember vaguely someone suggesting to
> move the script engine(s) to a different server, as an alternative physical
> architecture. In that case, the region wouldn't cache the scripts, they
> would go to that other server; only the effects of the scripts would be seen
> inworld. Not sure how far that idea went.
>
> This thread is making suspect that many people might be under the wrong
> impression that just because they have their own region server connected to
> someone's grid, they have 100% control over the assets in the region and
> even in their inventories. That is not correct. The persistent storage of
> everything is done in the grid-level servers, therefore under the control of
> whoever runs those servers. If the asset server kaputs, and there were no
> backups, you will loose just about everything you have in your region and in
> your inventory. (This is true independent of who has the control over the
> asset server, so maybe it's a good thing to have them on someone else's
> asset server, you can blame someone else :-)
>
>
> Dickson, Mike (ISS Software) wrote:
>
> Well, it's running scripts for prims in the region also isn't it…  And
> physics for physical items in the scene the region is managing. (These are
> assumptions, feel free to clarify, like Paul I'm trying to learn.)
>
>
>
> Mike
>
>
>
> From: opensim-users-bounces at lists.berlios.de
> [mailto:opensim-users-bounces at lists.berlios.de] On Behalf Of Diva Canto
> Sent: Sunday, November 30, 2008 11:36 AM
> To: opensim-users at lists.berlios.de
> Subject: Re: [Opensim-users] grid operation
>
>
>
> Right.
> When your region is connected to a physical grid, your region is *just* a 3D
> space server, nothing else.
> All assets belong to the asset server, all inventories belong to the
> inventory server, all users belong to the user server.
>
> Paul Fishwick wrote:
>
> Got it. So, the data are stored on the asset server. If this is
>
> so, it doesn't seem that my region server (the opensim instance
>
> I might run as part of someone's grid) is doing much of
>
> anything since any change in prim or agent attribute must be
>
> conveyed back to the grid's asset server.
>
> -p
>
>
>
> Diva Canto wrote:
>
>
>
> By "assets" I mean the data itself, the blobs/text/etc.
>
> The region prims/primitems storage holds only references to that data.
>
>
>
> Look inside OpenSim.db. There is no "data" there, only meta data and
>
> references to the data (by UUID) stored on the asset server.
>
>
>
> Paul Fishwick wrote:
>
>
>
> When you say the prims and primitems are not assets, I am confused.
>
> My understanding was that all items are assets, identified by their unique
>
> UUIDs. If I follow the point about the asset server, the asset servers
>
> stores all asset UUID references by region, but that the specific asset
>
> attributes (i.e., position of an object, or its texture) are stored by UUID
>
> in the region's DB?
>
> -p
>
>
>
>
>
> Diva Canto wrote:
>
>
>
>
>
> The asset server holds the assets for the entire collection of regions
>
> on that physical grid. For example, when you create an object inworld,
>
> the asset corresponding to that object is stored on the asset server.
>
>
>
> The region caches some assets in memory. For example, in that creation
>
> scenario, the asset would be on the cache of the region too.
>
>
>
> The region also has a database storing "prims" and "primitems". These
>
> are not assets; they are the prims that are inworld at any given time.
>
> The prims refer to assets (by UUID) that are stored on the asset
>
> server. Which, as the previous sentence says, may be cached in memory
>
> of the region.
>
>
>
> Paul Fishwick wrote:
>
>
>
>
>
> Right. But what, exactly, are these servers doing?  I guess I am trying
>
> to get at more of the architectural details of what types of messages are
>
> sent among servers (over the network and to the database(s)). For
>
> example, there are the UGAIM servers in grid mode. Does the grid's "A"
>
> server hold all of the assets on your region that  you plugged into the
>
> grid? Or does your region database (on the same computer as your
>
> opensim.instance) take care of that?
>
> -paul
>
>
>
>
>
> Ideia Boa wrote:
>
>
>
>
>
>
>
> If you run 1 region in a grid, you only run OpenSim server, the others
>
> servers (User, Grid, Asset, Inventory and Message) are running on the
>
> Grid servers with the grid OpenSim server.
>
>
>
>
>
>
>
> Paul Fishwick wrote:
>
>
>
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>
>
>
>
>
> If one hooks a region to a grid, what functions does the
>
> region server (operating on your computer) perform? The
>
> Grid servers are running asset and inventory management,
>
> so does this mean that the grid A and I machines handle
>
> the assets and inventory or is that the function of the region
>
> server that connects to the grid?
>
> -p
>
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