A total of 4 ficon ports are required with 2 cables. The FICON CTC's can be
shared by all connected LPARs via PATHIIN/PATHOUT in SYS1.PARMLIB(COUPLExx).
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
Timothy Sipples
Sent: Tuesday, June 2, 2020 12:07 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Base SYSPLEX setup
[CAUTION: This Email is from outside the Organization. Unless you trust the
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Brian,
1. If you haven't also looked at IBM Publication No. SB10-7174 yet, I'd refer
you to that one ("IBM Z FICON Channel-to-Channel Reference"). I believe you've
found SG24-5451 already.
2. You might not need additional FICON Express features at all. It depends on
how you're set up, but there's quite a bit of link sharing that's possible.
Quoting IBM, "A FICON channel with CTC capability may behave as both a standard
FICON channel connecting to standard FICON I/O control units, as well as having
an internal CTC control unit function in support of CTC connections.... Neither
FICON channel must be dedicated exclusively to CTC operations."
If you have (for example) two machines connected to at least one common FICON
SAN switch/director then you're *probably* good to go from a physical point of
view, for some minimum level of service anyway. Sure, do due diligence in terms
of performance and such, but it seems like a better idea to me to leave these
machines physically unmolested if possible rather than try to hack something in
(that's withdrawn from marketing).
There was probably some point in "ancient history" when the various sharing
options weren't available, but I believe all FICON-equipped z/Architecture
machines have these various CTC-related sharing capabilities at least in some
fashion. SB10-7174 repeatedly refers to an engineering change (EC) that was
available at least as far back as the IBM
z900 from what I can tell.
- - - - - - - - - -
Timothy Sipples
I.T. Architect Executive
Digital Asset & Other Industry Solutions IBM Z & LinuxONE
- - - - - - - - - -
E-Mail: sipp...@sg.ibm.com
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