Logical Paths; Mainframe Logical Paths (Example 1) - HP XP20000/XP24000 Operation Manual

Parameter
Number of Ports per Storage System
(DKA Slot Used)
Small Form Pluggable (SFP) Support
Maximum Cable Length
Note 1: The XP24000 supports up to six options while the XP20000 supports only one option.
Note 2: The maximum cable length values for the 16MFSR apply when 50/125 um multi-mode fiber
cable is used. If 62.5/125 um multi-mode fiber cable is used, the values shown above decrease as
follows:
500m (100 Mbps) decreases to 300m.
300m (200 Mbps) decreases to 150m.
150m (400 Mbps) decreases to 75m.

Logical paths

FICON/zHPF channels are capable of fast I/O rates. However, mainframes have a limited number
of paths that can be defined for a single control unit. One way to address this limitation is to use
logical paths. With multiple logical paths, additional paths are defined to the logical control units,
providing the host with access to a greater number of control unit interfaces and greater bandwidth.
FICON and FICON/zHPF support identical logical paths.
Logical paths are identified through a combination of channel image number, CU image number,
channel port address and CU port address. The following two figures show two conceptual drawings
of mainframe logical paths.
Figure 4 Mainframe Logical Paths (Example 1)
.
18 FICON/zHPF and ESCON host attachment
8MFS
8/ 16 / 24 / 32 / 40/ 48 / 56
/ 64 / 72 / 80 / 88/ 96 / 104
/ 112
Short Wave
500m / 300m / 150m
(See Note 2)
8MFLR
/ 16 / 24 / 32 / 40/ 48 / 56
/ 64 / 72 / 80 / 88/ 96 /
104 / 112
Long Wave
10km