Is Atlassian onDemand architecture multi tenant or single tenant?

I am just curious on how atlassian is providing its ondemand services and their internal architecture behind onDemand.

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OnDemand is partially multi-tenant (we have a a few shared services, e.g. the login system) but is mostly still single-tenant. Each customer has an OpenVZ container that has a database and multiple Tomcats running within (one per application).

You can view the slides from this Atlassian Summit presentation for more information. The info here is a bit dated but the funamentals remain the same.

We are working on 'multi-tenantising' more parts of the OnDemand offering, but (as I'm sure you can appreciate) this is a slow process.

Thanks a lot michael for clarifying.

Hi Norman, Thanks for replying. I have already seen that link. But one more link, from which I get confused because earlier atlassian was telling the benifits of single tenant over the multi tenant model. And I have read in the following link that they have used single tenant model for JIRA studio.

http://blogs.atlassian.com/2009/04/when_it_comes_t/

Jira Studio was an earlier attempt at SasS. They have shutdown that website as noted below.

https://developer.atlassian.com/pages/viewpage.action?pageId=16974434

I don't exactly see how it's multi-tenant, technically speaking. It's still an instance per organization etc. There are multiple Tomcat instances (in fact per Atlassian software and can't even be combined). It's multiple single-tenant software.

Though as long as things work...

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