> Is it necessary to have all the processors in the mainframe > of the same > type?
No. The physical hardware is the same, the difference is what microcode is loaded into the individual processor at IML. There are four types: 1) standard engine (can run all IBM operating systems) Used primarily by z/OS and VSE (or other customers with lots of money). Counts against the model number of the processor for software licensing (ie, add one and your software licensing bill goes up for most software). 2) coupling facility (specialized microcode to allow z/OS systems to do sysplex). Does not count against the model number of the processor for software licensing (I think). 3) IFL (Integrated Facility for Linux) Can run only VM and Linux. z/OS and VSE will not IPL on an IFL -- it's missing two critical instructions. Does not count against the model number of the processor for software licensing. 4) zAAP (specialized Java assist microcode for z/OS 1.6 and above). Only available on zArchitecture systems, and only usable by z/OS. Does not count against the model nubmer of the processor for software licensing. The physical system can support any combination of the four up to the number of processors available in the CPU MCM (minus the necessary I/O processors). With the exception of the zAAP for z/OS use, all the processors in a LPAR must be the same type. You may want to review the IBM Dictionary of Data Processing Terms. That will help you do your research. -- db ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
