HP XP20000/XP24000 HP StorageWorks XP Disk Array Mainframe Host Attachment and - Page 19

XP Disk Array Mainframe Host Attachment and Operations Guide

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Figure 5 Mainframe logical paths (example 2) . The FICON /zHPF CHAs provide logical path bindings that map user-defined FICON/zHPF logical paths. Specifically: • Each CU port can access 255 CU images (all CU images of logical storage system). • To the CU port, each logical host path (LPn) connected to the CU port is defined as a channel image number and a channel port address. The LPn identifies the logical host path by the channel image number and channel port address (excluding CU image number). In the following figure, Host Path(1) and Host Path(2) have the same channel image number and CU image number. However, they correspond to different paths because the channel address (and LPn) is different. Figure 6 FICON/zHPF channel adapter support for logical paths (example 1) . The following figure shows another example of logical paths. Instead of being controlled by physical ports, LPns on the storage system are controlled by CU images. Separating LPns from hardware provides flexibility that allows CU ports to share logical path resources as needed. Specifically: • Maximum number of LPn/CU images per storage system is 2048. XP Disk Array Mainframe Host Attachment and Operations Guide 19

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Figure 5 Mainframe logical paths (example 2)
.
The FICON /zHPF CHAs provide logical path bindings that map user-defined FICON/zHPF logical
paths. Specifically:
•
Each CU port can access 255 CU images (all CU images of logical storage system).
•
To the CU port, each logical host path (LP
n
) connected to the CU port is defined as a channel
image number and a channel port address. The LP
n
identifies the logical host path by the channel
image number and channel port address (excluding CU image number).
In the following figure, Host Path(1) and Host Path(2) have the same channel image number and CU
image number. However, they correspond to different paths because the channel address (and LP
n
)
is different.
Figure 6 FICON/zHPF channel adapter support for logical paths (example 1)
.
The following figure shows another example of logical paths. Instead of being controlled by physical
ports, LP
n
s on the storage system are controlled by CU images. Separating LP
n
s from hardware
provides flexibility that allows CU ports to share logical path resources as needed.
Specifically:
•
Maximum number of LP
n
/CU images per storage system is 2048.
XP Disk Array Mainframe Host Attachment and Operations Guide
19