IBM DS3500, Installation, User & Maintenance Manual

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Connecting iSCSI hosts to the DS3500
The DS3500 can support up to 64 hosts, depending on the number of host ports
and host partitions that are used on the RAID controller. To protect against the loss
of any one path from the host servers to the storage subsystem, use redundant
host connections.
To connect a hardware or software iSCSI initiator to the storage subsystem,
complete the following steps:
1. Connect a Category 5e or Category 6 Ethernet cable from the RAID controller
host port to a gigabit Ethernet switch, and then connect an Ethernet cable from
the switch to the host iSCSI initiator port. Figure 15 on page 24 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 RAID 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 RAID controller on the storage
subsystem to a gigabit Ethernet switch.
Notes:
1. Do not configure any two interfaces on the same subnet.
2. If you are using DHCP on more than one interface, multiple interfaces can end
up on the same subnet.
3. Direct iSCSI connections from the host to the storage subsystem are not
supported.
For illustrations of host connections, see “Single-controller iSCSI connections” on
page 60 and “Dual-controller iSCSI configurations” on page 62.
Host system
with two host
adapters
Host system
with two host
adapters
Fibre
Channel
switch
Fibre
Channel
switch
DS3500 DS3500
Figure 56. Example of two storage subsystems in a dual Fibre Channel SAN environment
Chapter 3. Cabling the storage subsystem and expansion enclosure
59