It's tricky.
Dana said about LOGICAL CUs, that means single physical box with
multiple CUADDs. Usually DASD array or virtual tape (also disk array in
fact).
However in Dana case we have single physical connection CPC to CU-box.
CUADD or logical CU is like LPAR on CPC.
However in order to connect multiple physical CUs/boxes using FICON, the
switch is necessary.
The only channel with supported daisy chain was Bus & Tag.
--
Radoslaw Skorupka
Lodz, Poland
W dniu 03.06.2020 o 16:53, Seymour J Metz pisze:
We have lots of multiple CU's on a channel,
Without a switch?
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Dana Mitchell [mitchd...@gmail.com]
Sent: Wednesday, June 3, 2020 9:53 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Base SYSPLEX setup
On Wed, 3 Jun 2020 13:05:11 +0000, Allan Staller <allan.stal...@hcl.com> wrote:
<quote> You cannot share chpid without the switch. It is point to point topology, not
daisy chains like in Bus&Tag. </quote>
That is incorrect. I routine share ahannels across LPARs.
The purpose of the switch is to concect multiple physical CECs to a single
device.
We have lots of multiple CU's on a channel, thats what CUADD is for.
When I try what Brian is doing, I receive msgCBDG198 (which there is no help
panel, have to find it in the KC):
CBDG198I There is a mix of FCTC and non-FCTC control units on channel path
proc_id.chpid. Control units: cu_number1, cu_number2
Explanation
All control units on the same channel path without dynamic switch must be
either all FCTC control units, or none of the control units must be an FCTC
control unit.
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