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Connecting hosts to the DS4500
The DS4500 supports direct attached connections to up to four hosts or supports
connection to five or more hosts using external devices.
For examples of redundant, partially-redundant, and non-redundant host and drive
loop configurations, see “Configuring the drive loops with storage expansion
enclosures” on page 77.
Connecting hosts directly
This section provides instructions for connecting up to four hosts, with two host
adapters each, directly to the DS4500 Storage Subsystem.
Before proceeding, make sure that you connect fiber-optic cables to all host
adapters that you are connecting to the DS4500 Storage Subsystem.
Important: Host mini hub 1 and mini hub 3 correspond to Controller A (top) and
mini hub 2 and mini hub 4 correspond to Controller B (bottom). To ensure
redundancy, connect each host to both controllers. You can use either the upper or
lower ports on either mini hub.
The example in the following procedure uses the upper ports for Hosts 1 and 4 and
the lower ports for Hosts 2 and 3.
Figure 78. Direct (out-of-band) managed storage subsystems
106 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide