Specifications

Chapter 7. Attaching to an IBM S/390 or IBM eServer zSeries

host

This chapter describes the host system requirements to attach the IBM S/390 or

zSeries host system to the ESS ESCON adapter or FICON adapter.

For information about how to use parallel access volumes (PAVs) for S/390 and

zSeries hosts, see the IBM Enterprise Storage Server User’s Guide. The guide

includes an overview of PAV and PAV requirements, and an example of the

input/output configuration program (IOCP).

Figure 38 shows how an ESS that is attached through ESCON links to different

computer-electronic complexes and logical partitions (LPARs). It also shows a

configuration that has been designed for optimum availability. For optimum

availability, make the ESCON host adapters available through all bays. For optimum

performance, have at least eight host adapter ports installed on four ESCON host

adapter cards in the ESS. This setup ensures the best performance from the

attached systems.

Attaching with ESCON

The following section describes how to attach an ESS with ESCON adapters.

LPAR A LPAR B

ESCD

LPAR C LPAR D

HA HA HA HA HA HA HA HA

Cluster 1 Cluster 2

CU 0 CU 2 CU 4 CU 6 CU 1 CU 3 CU 5 CU 7

CEC 1 CEC 2

1 2

S008176N

Legend

1– computer-electronic complex 1

2– computer-electronic complex 2

3– controller

4– ESCON director

5– logically partitioned mode

Figure 38. ESCON connectivity