For examples of redundant, partially redundant, and non-redundant host and drive
channel configurations, see “Fibre channel host loop configurations” on page 93.
Connecting secondary interface cables
This section is applicable to (direct) out-of-band management configurations only. If
your configuration uses host-agent (in-band) management, skip this section.
Use the Ethernet interface ports on the back of the storage subsystem to connect
the controllers for direct management of the storage subsystems (see “Direct
(out-of-band) management method” on page 91).
Important:
1. The serial interface ports are intended to be used by service technicians to
perform diagnostic operations on the storage subsystem. Incorrect use of the
serial port can result in loss of data access and, in some cases, in loss of data.
Do not make connections to the serial port unless you do so under the direct
supervision and guidance of IBM support personnel.
2. To minimize security risks, do not connect the DS4800 in a public LAN or public
subnet. Use a local private network for the DS4800 and the management
station Ethernet ports.
3. To ensure proper EMI shielding, always use quality braided and shielded serial
cables.
Connect a pair of Ethernet cables from the storage-management station to the
Ethernet ports for controller A (located on the top) and controller B (located on the
bottom) on the back of the storage subsystem. Figure 63 on page 90 shows the
Host 1, Host Adapter 1 and 2
Host 4, Host Adapter 1 and 2
Host 2, Host Adapter 1 and 2
Host 3, Host Adapter 1 and 2
12 3 4
4
3
2
1
ds48057
Figure 62. Cabling diagram for four redundant host connections
Chapter 3. Cabling the storage subsystem 89
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