Specifications

Attachment requirements
Ensure that your installation meets the following requirements:
1. One or two ESSs and no other I/O devices are attached to each ESCON host
adapter card.
Attention: To avoid causing static discharge damage when handling disk drive
modules and other parts, observe the precautions in “Handling electrostatic
discharge-sensitive components” on page 10.
2. The cables are connected correctly and are seated properly.
Migrating from ESCON to native FICON
The following section provides information about how to migrate from ESCON to
native FICON. FICON is supported only on Models F10 and F20.
Note: FICON support consists of hardware enhancements for enterprise servers,
host software upgrades, ESS LIC, and adapters. If your ESS is not at the
level that supports FICON, you must install the LIC upgrade. You can
perform a nondisruptive update to most hardware and software upgrades.
Native ESCON configuration
Figure 40 on page 73 shows an example of a native ESCON configuration. The
configuration shows an S/390 or zSeries host that has four ESCON channels 1
attached to the ESS through two ESCON directors 3. The channels are grouped
into a channel-path group 2 for multipathing capability to the ESS ESCON
adapters 4.
Cluster 1 Cluster 2
Board 0 (CPI4) Board 1 (CPI6) Board 0 (CPI5) Board 1 (CPI7)
______________ ______________ ______________ ______________
|||| |||| |||| ||||
Slot# 0123 0123 0123 0123
ID
Port 0 806 804 802 800 816 814 812 810 80E 80C 80A 80C 81E 81C 81A 818
Port 1 807 805 803 801 817 815 813 811 80F 80D 80B 809 81F 81D 81B 819
Tag
Port 0 00 04 08 0C 20 24 28 2C 80 84 88 8C A0 A4 A8 AC
Port 1 01 05 09 0D 21 25 29 2D 81 85 89 8D A1 A5 A9 AD
Figure 39. Port identification for S/390 and zSeries TSO commands
72 ESS Host Systems Attachment Guide