Tuesday Jul 09, 2013

Limits on LDom numbers

I got a question - or a few linked questions - about installing LDoms in a Server Pool through Ops Center.

I have some T5240s (2x SPARC T2+) and some T5440s (4x SPARC T2+) running as standalone Control Domains with some LDoms each.

1. Is there any limit to the number of CDoms per Server Pool within Ops Center?

No, there is not.

2. What about the number of LDoms per Server Pool, per CDom, or per server?

The only limitation on the number of LDoms is that a server or physical domain can't have more LDoms than it has threads, or have more than 128. If you get close to that limit and start having LDoms with one thread, performance will start to suffer.

3. Is it possible to mix them within the same server pool?

Yep. Depending on your LDom version and the hardware, live migration might not be possible, but you can have server pools with different hardware types, and automatic failover will work fine.

If you're also looking at setting up Server Pools through Ops Center, we put together a how-to about setting up a Server Pool which could be helpful. There's also a white paper on the OTN with best practices for setting up a virtualized SPARC environment.

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