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EMC Fibre Channel Storage System Model FC4700 Configuration Planning Guide
Storage-System Hardware
Planning Your Hardware Components
This section helps you plan the hardware components — adapters,
cables, and storage systems and site requirements — for each server
in your installation.
For shared switched storage or shared-or-clustered direct storage,
you must use high-availability options: two SPs per storage system
and at least two HBAs per server. For shared switched storage, two
switch fabrics are required.
For unshared direct storage, a server may have one or two HBAs.

Components for Shared Switched Storage

The minimum hardware configuration required for shared switched
storage is two servers, each with two host bus adapters, two Fibre
Channel switch fabrics with one switch per fabric, and two SPs per
storage system. Two SPS units (standby power supplies) are also
required. You can use more servers (up to 15 are allowed), more
switches per fabric, and more storage systems (up to four are
allowed).

Components for Shared-or-Clustered Direct Storage

The minimum hardware required for shared switched or
shared-or-clustered direct storage is two servers, each with two host
bus adapters, and one storage system with two SPs. You can use more
storage systems (up to four are allowed).

Components for Unshared Direct Storage

The minimum hardware required for unshared direct storage is one
server with two host bus adapters and one storage system with two
SPs.You can choose more storage systems (up to four are allowed).