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pSeries2
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NO Host Attachment Group defined for host pSeries1. By default,
the 4 ports are placed in 4 host attachments
Two host attachment groups defined for host pSeries2
pSeries3
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One host attachment group defined for host pSeries3
Figure 9-1 Diagram of hosts and host attachment groups
In Figure
A host attachment can be configured to access specific disk subsystem I/O ports or all valid disk subsystem I/O ports.
Host attachments can be configured to access specific volume groups.
A specific host attachment (one port or set of grouped ports) can access only one volume group.
However, multiple host attachments, even different open system host types, with the same blocksize and addressing mode, can access the same volume group. The safest approach to this concept is to configure one host per volume group. If shared access to the LUN is required, for example, for dual pathing or clustering, then the shared LUNs may be placed in multiple volume groups as shown in Figure
For FICON attachment, access is controlled by zSeries HCD/IOGEN definitions. Some FICON attachment considerations:
–One storage subsystem FICON host definition will be required as the trigger to set the I/O adapter that will be accessed by the FICON protocol.
–Default volume groups are automatically created, allowing anonymous access for
FICON.
One set of host definitions may be used for multiple storage, storage units, and storage complexes.
Chapter 9. The DS Storage Manager: Logical configuration 153