On a z/890 I'm running z/VM 5.2 in an LPAR with 2 dedicated IFL's. There are also 2 CP's (capacity setting 260) running multiple z/OS LPARs.
From z/VM: q capability CAPABILITY: PRIMARY 4224 SECONDARY 2416 Ready; T=0.01/0.01 13:20:03 The z/Architecture Principles of Operations describes the information returned by the STSI instruction from which the above values are obtained. In particular it states (pg 10-117) that "a lower value indicates a proportionally higher CPU capacity." The definition of which engines are considered PRIMARY and which are SECONDARY is not spelled out anywhere that I can find. My expectation wa s that the engines in use by the LPAR would be defined as PRIMARY. Since the IFL's should be faster than the non-full-speed CP's I expected the PRIMARY to be faster, but the output from Q CAPABILITY seems to indicate the SECONDARY CPUs are faster. This leads me to conclude that the CP's are (always?) PRIMARY regardless of what the engines the LPAR uses. Is that correct? If not, what is? Brian Nielsen
