IBM DS3500, Installation, User'S, And Maintenance Manual

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To connect a hardware or software iSCSI initiator to the storage subsystem, complete the following steps:
1. Connect Ethernet cables from the controller host port to the 1 gigabit or 10 gigabit Ethernet switch:
v
For a 1 gigabit Ethernet switch, Connect a Category 5e or Category 6 Ethernet cable from the
controller host port to a gigabit Ethernet switch, and then connect an Ethernet cable from the
switch to the host iSCSI initiator port.
v
For a 10 gigabit Ethernet switch, connect a Category 6 (shielded or unshielded), Category 6A
(shielded or unshielded), or Category 7 Ethernet cable from the controller host port to a gigabit
Ethernet switch, and then connect an Ethernet cable from the switch to the host iSCSI initiator port.
For these cables, the following cable lengths are supported:
– Cat 6 unshielded - 30m
– Cat 6 shielded - 100m
– Cat 6A unshielded - 55m
– Cat 6A shielded - 100m
– Cat 7 - 100m
Note: These cables must be customer-supplied and are not available for ordering with the DS3500.
IBM recommends the use of Category 6A or Category 7 cables to obtain the highest signal quality
and reliability when operating at 10 Gbps, because these cables are designed to support 10 Gbps
and minimize alien crosstalk. 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 have questions about which cables to use.
Figure 3-2 on page 3-2 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:
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” and “Dual-controller iSCSI
configurations” on page 3-43.
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.
3-40
System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide