On Wed, 5 Apr 2017 18:23:29 +0000, Jesse 1 Robinson <[email protected]> wrote:
>I’m curious about using CA MIM Resource Sharing within a sysplex. Historically >I used > it in the days before sysplex, before PDS/E, before other newfangled > contraptions > that depend on XCF for serialization. We still use MIA for tape allocation > across > sysplexes and across data centers. What does MIM offer for ENQ within a > sysplex? If it is a basic sysplex, MIM (with CTCs) runs circles around GRS RING in terms of performance. If you only have 2 systems it probably doesn't matter, but as soon as you have 3 more systems you can really notice the difference. *disclaimer* It has been quite a number of years since I have been at a GRS RING shop with 3 or more systems but I recall a CA-1 scratch run taking many hours due to the cross system ENQs then my client switched to MIM and the scratch run ran in probably half the time. The improvement in time logon to TSO and get to the ISPF main menu was very noticeable. For a parallel sysplex where the scope of sharing is just withing the sysplex, I don't know why anyone would use MIM over GRS these days. Also, with the cheaper cost of ICF engines and inexpensive memory, I would think the cost would at least be similar to licensing MIM. Regards, Mark -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS ITIL v3 Foundation Certified mailto:[email protected] Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html Systems Programming expert at http://search390.techtarget.com/ateExperts/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
