IBM System Storage Subsystem DS5020 - Manual (Page 112)

Connecting hosts to the DS5020 using Fibre Channel host ports
The DS5020 supports redundant direct attached connections to up to four hosts. To
Make sure that you have full protection against the loss of any one Fibre Channel
path from the host servers to the DS5020 storage subsystem, always use
redundant host connections by connecting each host to the applicable single-ported
host channels on both RAID controllers A and B. Using the Fibre Channel switches,
up to 512 hosts can be redundantly attached to the DS5020 storage subsystem in a
Fibre Channel SAN fabric.
To connect a Fibre Channel host adapter to the DS5020 RAID controllers, perform
the following steps:
1. Install SFP modules in host ports on RAID controllers A and B.
Note: The alignment of the single-ported host channels on controller A are
opposite those of controller B. Before inserting an SFP module into a
host port, verify that the SFP module is rotated correctly to match the
alignment of the host port on the RAID controller. Do not force-fit.
2. Connect the Fibre Channel cables from the SFP modules in the DS5020 RAID
controller host ports to either the SFP modules in the Fibre Channel switch or
5
Two storage
subsystems
Two storage
subsystems
Fibre Channel
Ethernet
network
Host
server
Management
station
Fibre Channel
Figure 53. Direct (out-of-band) managed storage subsystems
82 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide