Front-end modules
The front-end modules (FEMs), also called channel boards (CHBs), control the transfer of
data between the host and cache memory. The storage system supports Fibre Channel (FC)
and iSCSI front-end modules (FEMs) for attachment to host servers. The front-end module
LEDs indicate the operating status of the module.
Specification Fibre 32-Gbps Ready iSCSI 10G iSCSI 10G BASE-T
Model number DW-F800-4HF32R DW-F800-2HS10S DW-F800-2HS10B
Number of PCBs 1 1 1
Host interface FCP iSCSI (optical) iSCSI (copper)
Data transfer rate (MB/s) 16Gbps:
400/800/1,600
32Gbps:
800/1,600/3,200
1,000 100/1,000
Number of options
installed( ): DKB slot used
2/4/6/8/12/14/16
(14/16/18/20)
2/4/6/8/12/14/16
(14/16/18/20)
2/4/6/8/12/14/16
(14/16/18/20)
Number of ports per PCB 4 2 2
Number of ports per
storage system( ): DKB slot
used
8/16/24/32/48/56/64
(56/64/72/80)
4/8/12/16/24/28/32
(28/32/36/40)
4/8/12/16/24/28/32
(28/32/36/40)
Maximum
cable length
Short
wave
1
400m/190m/125m/
100m
550m -
Long wave 10km - -
Copper - - 50m (cat 6a)
1. When 50/125mm laser optimized multi-mode fibre cable (OM3 or OM4) is used. When using other
cable types, contact customer support.
Front-end modules
Chapter 2: Hardware overview
Hitachi Virtual Storage Platform E990 Hardware Reference Guide 18
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