Re: VTAM question on XCF.
On Mon, 3 Dec 2007 19:07:07 +, Ted MacNEIL <[EMAIL PROTECTED]> wrote: >... >IIRC, VTAM only uses CTC's and not XCF. >... VTAM dynamic XCF support went in about 2.7 or 2.8. (I could be thinking TCP/IP support. VTAM's support may have been earlier.) If you already had APPN support you automatically got APPN connectivity (whether you wanted it or not) as soon as you had 2 VTAMs at that level in the Sysplex. >>Second question: a Basic Sysplex connects with CTCs. Do I need CTCs in a Parallel Sysplex or does the CF entirely replace the CTCs? > >You still need the CTCs. >... If this is strictly a VTAM question, the answer is "No" (for APPN). In a Sysplex (even basic, not necessarily parallel) you automatically have dynamic XCF connectivity as long as you have XCF signalling amongst the MVS images. As Skip said earlier in this thread, you probably ought to have the CTCs for backup. And last I saw, IBM was still saying that VTAM CTCs outperform XCF. (And last I knew people understanding XCF signalling say that can't be true unless the VTAM overhead is terrible.) Pat O'Keefe -- 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
Re: VTAM question on XCF.
>the VTAMs can talk to each other via XCF instead of/in addition to CTCs if >they are all in the same sysplex. Correct? IIRC, VTAM only uses CTC's and not XCF. >Second question: a Basic Sysplex connects with CTCs. Do I need CTCs in a >Parallel Sysplex or does the CF entirely replace the CTCs? You still need the CTCs. (Of course, I implemented Parallel SYSPLEX in 1994, and haven't really gone back to revisit, so I could be out of date.) - Too busy driving to stop for gas! -- 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
Re: VTAM question on XCF.
1. Yes, VTAM will talk across the 'sysplex' CF structures in a parallel
sysplex. We discovered this early on more or less by accident. You also
have the option of 'VTAM generics' via a separate CF structure.
2. CTCs are not required in a parallel sysplex, but every discussion I've
ever seen on the topic strongly recommends them as a backup mechanism. If
CF communication fails or gets severely interrupted, the CTCs provide an
alternate method of communication. You may be hosed anyway, but at least
you'll go down with a few salient messages to ponder.
.
.
JO.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
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This relates to my previous question about Parallel Sysplex. I'm trying
to read the books quickly to get a "Power Point" presentation ready.
IIRC, the VTAMs can talk to each other via XCF instead of/in addition to
CTCs if they are all in the same sysplex. Correct?
Second question: a Basic Sysplex connects with CTCs. Do I need CTCs in a
Parallel Sysplex or does the CF entirely replace the CTCs?
Many thanks from a very Sysplex ignorant person.
--
John McKown
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VTAM question on XCF.
This relates to my previous question about Parallel Sysplex. I'm trying to read the books quickly to get a "Power Point" presentation ready. IIRC, the VTAMs can talk to each other via XCF instead of/in addition to CTCs if they are all in the same sysplex. Correct? Second question: a Basic Sysplex connects with CTCs. Do I need CTCs in a Parallel Sysplex or does the CF entirely replace the CTCs? Many thanks from a very Sysplex ignorant person. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. -- 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
