Visara CCA-3074 Planning Guide - Manual (Page 26)

Chapter 2. Planning for Your Installation
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Determining the Number of CCA-3074s
Use the CCA-3074 Maximum Capability Chart on the previous
pages to help in determining the number of CCA-3074 and
external Coax Subsystems that will be required to satisfy your
requirements.
The minimum number of CCA-3074 platforms that are required
is determined by several factors:
• Whether redundant Console Controllers will be used
(recommended)
• The number of ESCON and FICON cables required to connect
to the LPARs defined
• Whether redundant ESCON or FICON Directors are being
used
• The number of LPARs defined
• The total number of consoles required
A minimum of two consoles, each located on separate CCA-
3074s should be used for every critical application. This allows
for a CCA-3074 to be powered down for routine maintenance and
configuration changes. At least two CCA-3074s should be
connected to each LPAR, to provide these connections.
When Directors are used, the overall number of CCA-3074s that
would be required may be greatly reduced. Up to 16 LPARs (host
circuits) can be connected through each ESCON and FICON
interface.
When redundant Directors are available, two ESCON or FICON
interfaces may be desired. The total number of LPAR connections
(host circuits) that a CCA-3074 with two ESCON and four
FICON interfaces can be configured for is 96.