Thursday, August 22, 2013

HP UX and VPars

Can one cluster two vpars on one physical server for failover? Would it be better than clustering two vpars on two different physical servers? 
Could we dynamically reconfigure vpars on a physical server to add/reduce CPUs/memory?
yes you can have one cluster with two VPARS on the same server but your are not taking full advantage of the MC ServiceGard cluster software. The rule of thumb in a cluster is to have one VPAR on one server and your other VPAR on another server. If both VPARS are on the same server and you suffer a hardware failure you will not be able to run your application. Were as if your second VPAR is on a separate server you just move your application/packages on that server. 
Question: Would it be better than clustering two vpars on two different physical servers? 
Answer: See answer to question #1 
Question:Could we dynamically reconfigure vpars on a physical server to add/reduce CPUs/memory? 
Answer:If you have free/unallocated CPUs they can be allocated via the "vparmodify" command. Memory can not be allocated dynamically, it can only be done when that VPAR is down. Even when the VPARS is down you can only add or reduce memory from a VPAR on the same NPAR. 


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