The quality of Category 6 cables can vary between different manufacturers
and even different manufactured lots. Please contact your IBM representative
or reseller if you require any clarifications.
Figure 17 on page 32 shows the host ports.
2. Create a redundant host connection:
v If the storage subsystem is a single-controller storage subsystem, connect an
Ethernet cable from the second host port on the controller to a gigabit
Ethernet switch.
v If the storage subsystem is a dual-controller storage subsystem, connect an
Ethernet cable from the host port on the other controller on the storage
subsystem to a gigabit Ethernet switch.
Note: Do not configure any two interfaces on the same subnet. If you are using
DHCP on more than one interface, multiple interfaces can end up on the same
subnet. Direct iSCSI connections from the host to the storage subsystem are not
supported.
For illustrations of host connections, see “Single-controller iSCSI connections” and
“Dual-controller iSCSI configurations” on page 73.
Single-controller iSCSI connections:
The following illustration shows a single controller storage subsystem that is
attached to a single host. This configuration has no redundancy.
A system with dual iSCSI ports can provide enhanced performance compared to a
system that uses only one iSCSI port.
The following illustration is an example of a host that uses multiple ports attached
to a single-controller configuration. This configuration provides some path
redundancy.
1 Gigabit/10 Gigabit
Ethernet switch
Host system
with one iSCSI
connector
DS3500
e35i0001
Figure 64. Single-host, single-controller iSCSI configuration
Chapter 3. Cabling the storage subsystem and storage enclosure 71
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