You **do** have to worry about how many CPs an LPAR has. Not always, but if you know how it works, you can avoid the pitfalls, surely when you start using capping. My customer learned it the hard way on a 9672. We had a partition capped at 60%, a lot. But, it had 6 engines, so each engine was capped at 10%. DB2/VM had a very hard time: it was able to consume a bit more than this 10% but not enough. If all your important processes are MP capable, I guess you have to worry less. A UP process though may have a hard time to consume enough when the weight distributed over the logical processors is low. BTW, VM's dispatcher works the same way.
2007/3/13, Curren, Pat J. <[EMAIL PROTECTED]>:
I have used 1,000 as the total of the weights for years now with excellent results. Just figure out how much of the machine you want your production to take and give it that much weight, ie: if you want production to have 60% of the machine give it 600 as a weighting factor and give test 400 for a total of 1,000. You don't have to worry about how many CPs an LPAR has. The number of logical CPs determines the maximum amount of MIPS you can use. For example if you have 5 logical CPs and a weight of 600/1000, then the LPAR dispatcher will give you 60% of 5 physical CPs. You can use up to 100% of 5 CPs if nobody else is using them. --
Kris Buelens, IBM Belgium, VM customer support
