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2-8 Architecture and Components
Hitachi Universal Storage Platform V/VM User and Reference Guide
Table 2-1 lists the specifications and configurations for the front-end directors
and specifies the number of channel connections for each configuration.
Table 2-1 Front-End Director and Channel Specifications
Parameter Specifications
Number of front-end director features USP V: 1 – 8, 14 when FEDs are installed in BED slots
USP VM: 1 – 3
Simultaneous data transfers per FED pair:
FICON
ExSA (ESCON)
Fibre-channel
8
8
8, 16
Maximum data transfer rate:
FICON
ExSA (ESCON)
Fibre-channel
400 MB/sec (4 Gbps)
17 MB/sec
400 MB/sec (4 Gbps)
Physical interfaces per FED pair:
FICON
ExSA (ESCON)
Fibre-channel
8
8
8, 16
Max. physical FICON interfaces per system USP V: 112
USP VM: 24
Max. physical ExSA interfaces per system USP V: 112
USP VM: 24
Max. physical FC interfaces per system USP V: 224
USP VM: 48
Logical paths per FICON port 2105 emulation: 65,536 (1024 host paths × 64 CUs)
2107 emulation: 261,120 (1024 host paths x 255 CUs)
Logical paths per ExSA (ESCON) port 512 (32 host paths × 16 CUs) *
Max. FICON logical paths per system 2105 emulation: 131,072
2107 emulation: 522,240
Max. ExSA (ESCON) logical paths per system 8,192
Maximum LUs per fibre-channel port 2048
Maximum LDEVs per storage system USP V: 130,560 (256 LDEVs x 510 CUs)
USP VM: 65,280
*Note: When the number of devices per CHL image is limited to a maximum
of 1024, 16 CU images can be assigned per CHL image. If one CU includes 256
devices, the maximum number of CUs per CHL image is limited to 4.