Visara SCON-20L Installation - Manual (Page 11)

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Chapter 2. Planning for Your Install
Identifying the Environment
First, take a moment to fill out the following worksheet to determine what your
environment is, or what you wish to create. Several topic paragraphs are provided to
help determine what is needed to satisfy your requirements. Finally, a worksheet at the
back of this book may be used to map out your configuration prior to actually attempting
to configure the SCON. You may want to create a spreadsheet with a similar layout or
make several copies of the worksheet to encompass your entire configuration requirement.
Number of mainframes? Number: _______
Number of LPARs? Number: _______
EMIF supported on any of the mainframes? (Yes/No) _______
ESCON Directors being used? (Yes/No) _______
Operating Systems in use? (OS/390, MVS/ESA, VM/ESA, VSE/ESA) _______
StorageTek LMUs (Yes/No) _______
IBM 3290 (Yes/No) _______
Redundant Console Controllers (Yes/No) _______
Number of consoles needed for each LPAR Number: _______
Need/desire to use one console for multiple LPARs (Yes/No) _______
Need to display multiple LPARs at once on a display (Yes/No) _______
Remote Access requirement? (Yes/No) _______
Hot Console session requirement (Yes/No) _______
Shared session requirement (Yes/No) _______
Replacing Existing ESCON 3174 Controllers
Each of your existing 3174 controllers is capable of communicating to only one LPAR,
and appearing as only one control unit image (CUI). Each 3174 is therefore utilizing
only one CUADD of the 16 CUADD values that can be defined (0-F). It is common to
use the same CUADD number for each 3174 (if no CUADD parameter is found in the
CNTLUNIT macro of the gen, CUADD=0 is implied). The SCON provides support for
multiple CUIs, allowing it to replace multiple 3174s. To support two or more LPARs
through the same interface on the SCON using the same CUADD value requires
configuration of ‘Channel Path Filtering’ as the protocol option. To replace multiple
3174s with a single SCON, even if they have ESCON interfaces, you will normally
have to make some minor gen changes.