On Wed, 2 Aug 2006 14:15:40 +0200, Vernooy, C.P. - SPLXM <[EMAIL PROTECTED]> wrote:
> >We are investigating the performance differences of the various MIM >Control File configurations. We are fully Ficon and combine four z/OS >1.6 Systems from two Sysplexes in the Mimplex, so our options are: >Dasdonly, CTCDasd and CTConly. > >Does anybody have information about performance and allowable load of >these three configurations? > 1st = CTCONLY 2nd = CTCDASD 3rd = DASDONLY ** (see note below) CTCDASD is the same performance as CTCONLY (since it uses CTCs) except when a system joins the MIMplex. Then the VCF (virtual control file) temporarily migrates back to DASD during that process. CTCONLY is of course better with FICON than ESCON. That is what we use here since we share tape and dasd across sysplex boundries. ** DASDONLY is also what is used when putting the control file in a coupling facility. This is the best configuration of all and is comparable to GRS STAR. Of course you can only do this if your MIMplex = parallel sysplex. I am not sure what you mean by "allowable load". Obviously the more systems you add, the more overhead. But this is not like GRS ring where performance goes to H E double hockey sticks when you have more than 2 systems. I have 8 systems in our FICON CTCONLY MIMplex running MII, MIA, and MIC. MII/MIC run in one asid and MIA runs in a separate ASID. I think the architecture of MIM has always been more like a star (as opposed to a ring) and that is why it has always out performed GRS prior to GRS STAR. Perhaps if Norman Hollandar is lurking he may have more information since he works for CA. You can also call the vendor, in my experience they are very good at working with customers on MIM performance / tuning issues. Regards, Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group mailto: [EMAIL PROTECTED] z/OS and OS390 expert at http://searchDataCenter.com/ateExperts/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
