Specifications

Note: If you have not configured the port, only the topologies for point-to-point and
arbitrated loop are supported. If you have configured the port, and you want
to change the topology, you must first unconfigure the port. After you
unconfigure the port, you can change the topology.
Fibre-channel cables and adapter types
For detailed information about fibre-channel cables and adapter types, see IBM
TotalStorage Enterprise Storage Server Introduction and Planning Guide.
Fibre-channel node-to-node distances
For detailed information about fibre-channel node-to-node distances, see IBM
TotalStorage Enterprise Storage Server Introduction and Planning Guide.
LUN affinity
For fibre-channel attachment, LUNs have an affinity to the host’s fibre-channel
adapter through the worldwide port name (WWPN) for the host adapter. In a
switched fabric configuration, a single fibre-channel host could have physical access
to multiple fibre-channel ports on the ESS. In this case, you can configure the ESS
to allow the host to use either:
v All physically accessible fibre-channel ports on the ESS
v Only a subset of the physically accessible fibre-channel ports on the ESS
In either case, the set of LUNs that are accessed by the fibre-channel host are the
same on each of the ESS ports that can be used by that host.
Targets and LUNs
For fibre-channel attachment, each fibre-channel host adapter can architecturally
attach up to 2⁶⁴ LUNs. The ESS supports only a maximum of 4096 LUNs divided
into a maximum of 16 logical subsystems each with up to 256 LUNs. If the software
S008943N
1
2
1
2
Legend
1 is the host system.
2 is the ESS.
Figure 7. Arbitrated loop topology
Chapter 1. Introduction 15
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