HP Mainframe Connectivity Design Guide

Table 56 XP7 configuration rules (continued)
DescriptionRule
A UNITADD is the starting address of the range of devices configured in the LCU. For example, if the
LCU has 256 devices configured with the device addresses x'00' through x'FF', then x'00' is the
UNITADD.
10
The UNITADD parameter contains two fields, the first field is UNITADD and the second field is a decimal
value describing the range of addresses in the LCU. For example, an LCU with 256 devices and
configured with the device addresses x'00' through x'FF' has a UNITADD parameter of 00,256.
11
The LPAR uses a logical path to communicate with the LCU. This path includes the CHPID on the
mainframe, the FICON port on the CU, and any ports and directors in the path. There can be up to
eight logical paths from an LPAR to any LCU.
12
The system programmer assigns one or more 4-digit hexadecimal SSIDs to your storage subsystem. The
SSID is assigned to a range of either 64 volumes or 256 volumes. In an XP7 storage system, the valid
13
range for the SSID is x'0004' though x'FEFF'. HP recommends using one SSID per LCU, with a range
of 256 volumes per SSID.
XP7 configuration examples
This section provides examples of the XP7 configurations with and without PAVs.
XP7 configuration without PAVs
An XP7 DASD array configured to provide 2,048 mainframe volumes requires a minimum of 8
LCUs, each with 256 device addresses.
Table 57 (page 101) lists a sample XP7 configuration without PAVs. All numbers are hexadecimal
unless noted otherwise.
Table 57 Sample XP7 configuration without PAVs
Base or
PAV
SSID
2
Device
nl
addressLCU
UNITADD
(starting
address,
range
1
)
CUADDCUNUMBER
Device
nl
number
Base
1000
00–FF
00
00,256
0010001000–10FF
1001010111001100–11FF
1002020212001200–12FF
1003030313001300–13FF
1004040414001400–14FF
1005050515001500–15FF
1006060616001600–16FF
1007070717001700–17FF
1
The starting address is a hexadecimal number, and the range is a decimal number.
2
The SSID value is supplied by the system programmer.
XP7 configuration rules 101