Brian, We've actually been thinking about this too, as we evaluate moving to z14's. We currently have a 5 member GRS ring that could really benefit moving to GRS Star, but nobody want's to spend any $ for an ICF.
As of BC12 generation IBM was still recommending against using GPs for CF processors: According to an IBM paper titled: Coupling Thin Interrupts and CF Performance in Shared Processor Environments While it is possible to use general purpose processors, CPs, as CF processors and share the CPs with z/OS and other similarly defined CFs, this is not a recommended configuration. Using CPs as CF processors creates interaction between z/OS and the CF in terms of cache reuse and other factors that may impact performance. Dana On Tue, 29 Jan 2019 00:23:56 -0600, Brian Westerman <[email protected]> wrote: >Hi, > >Has anyone had any experience with using the internal coupling channels on a >z13. "supposedly" IBM has removed the active wait problems (where the CF lpar >would try to use 100% of whatever it gets from PR/SM), but I was wondering if >it's ready for prime time yet. I have a z13s (single CPU) with 3 LPARs on it, >they are fairly low use, but I think it'a about time the started to use GRS >since they share DASD (it was small, but now more and more as time goes on). >They have been lucky so far, but I would rather not rely on luck. They don't >have the cash to add a specialty processor, and if IBM has really reduced the >overhead of ICF, then it might be a good fit for them. > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
