FW 05.01.00 and SW 07.01.00 HP StorageWorks SAN High Availability Planning Guide (AA-RS2DC-TE, June 2003)

Planning Considerations for Fibre Channel Topologies
111SAN High Availability Planning Guide
Although Figure 46 depicts a UPM card map only for the Director 2/64,
physical port numbers and logical port addresses can be extrapolated for the
Director 2/140 (140 ports), Edge Switch 2/16 (16 ports), Edge Switch 2/24
(24 ports), and Edge Switch 2/32 (32 ports).
Management Limitations
The following considerations must be given to the limitations and interactions of
director or switch management when using Open Systems management style
(FCP) or FICON management style:
■ FICON port-to-port connectivity is hardware enforced, while FCP
port-to-port connectivity is software enforced.
— FICON architecture controls connectivity through a host-based HCD
program, a director or switch-resident management server called the
control unit port (CUP), and a director or switch-resident prohibit
dynamic connectivity mask (PDCM) array associated with each logical
port address. The CUP and PDCM arrays support hardware enforcement
of connectivity control to all port connections; therefore when a director
or switch is set to FICON management style, zoning information is
restricted by the hardware instead of by the name server.
— When the director or switch is set to Open Systems management style,
CUP support and the PDCM array are disabled. For FICON devices
attached to the director or switch, the user must manage connectivity to
match logical port addressing established through the host-based HCD
program. For example if a FICON host expects connectivity through
logical port address 1C, the user must ensure the host is connected to
physical port number 24. Refer to Figure 46 for the physical port number
and logical port address map.
■ The FCP protocol supports multiple domains (multiswitch fabrics), while the
FICON protocol is limited to a single domain (single-switch fabrics) due to
single-byte address limitations inherited from ESCON. Consequently, when a
director or switch is set to FICON management style, E_Port connections
(ISLs) are not allowed with another edge switch. The director or switch
reports an attempted E_Port connection as invalid and prevents the port from
coming online.