Rob McNelly, the esteemed POWER7 Champion, sent me a really good questions and I thought would make a good blog as I get asked this about once a month.
I have cut down the questions a but but it is a two parts:
- His customer is thinking about putting Systems Director on to their NIM server. Rob remembered me commenting on this but wants the details.
- They are planning to give it 1 dedicated Power7 core and 12G memory.
What do I think about that?
- 2 years ago this combination (NIM & ISD) was not allowed ( I think it was just not tested so not support rather than it being a problem) but now is OK. So you can find older websites pages with duff info.
- However, I do NOT recommend it - to get a NIM to push out the very latest AIX version, the NIM server needs to be at that AIX level.
- But Systems Director may not be supported at that very new AIX level.
- Then you can't get Systems Director support.
- This is a "will probably work" but not supported risk that you have to decide.
- I also like ISD to have a dedicated NIM server - it can be treated as a disposable slave resource.
- I don't have to worry about it nor back it up. If it gets trashed I can build in in 10 minutes and ISD will re-push the AIX updates to it.
- If I save VMControl appliances to the NIM server then they will need backing up as they would take time to recreate.
- It will work, if you never want the latest AIX release (always one level behind the curve). Otherwise use a separate NIM server, which is what Nigel does.
- I also have a single user Systems Director but regularly see it using 2 or 3 CPUs in peaks.
- Running a single dedicated CPU means this will make Systems Director look and feel slow.
- With a dozen users the CPU use will go up and be a lot more peaky.
- With NIM it would not matter but Systems Director GUI would suffer and so would the user.
- Personally a dedicated CPU for NIM is pretty dumb - that CPU could be used else where most of he time.
- So E=2 shared CPU and VP=4 sounds good starting point to me.
- 8 GB of memory works for me but I have Active Memory Expansion switched on. 12 GB will do no harm.
- Give it more headroom and share the CPUs.
I hope that helps, cheers, Nigel Griffiths