IBM System Storage Subsystem DS5020 - Manual (Page 118)

Note: The minimum DS5020 configuration is two partitions. The maximum is 128
partitions. Configuration upgrades are available as upgrade options. Contact
your IBM reseller or marketing representative for more information.
DS5020 host iSCSI configurations
This section provides the following examples of DS5020 host iSCSI configurations:
v Single-host, multiple-port configuration, as shown in Figure 61
v Multiple-host, multiple-port configuration, as shown in Figure 62 on page 89
v iSCSI and Fibre Channel hosts, multiple-port configuration, as shown in
Figure 63 on page 89
v Example of an incorrect configuration: Single-host, iSCSI and Fibre Channel, as
shown in Figure 64 on page 90
v Multiple-host, multiple-port, multiple-switch configuration, as shown in Figure 65
on page 91
Notes:
1. The DS5020 does not support direct connections from the host systems to the
iSCSI ports on the storage subsystem.
2. The DS5020 does not support connections to both iSCSI and Fibre Channel
ports from the same host system.
3. The following illustrations do not accurately represent the controller locations or
port locations in the DS5020. The illustrations are for illustration purposes only.
Figure 61 shows an example of a multiple port, single-host configuration. A system
that uses multiple iSCSI ports can provide enhanced performance compared to a
single-port iSCSI connection.
Figure 62 on page 89 shows a multiple-host, multiple-port configuration. For cluster
configurations, the following illustration is an example of a multiple-host,
multiple-port, and redundant path and controller configuration. You can replace the
two gigabit Ethernet switches in the illustration with one large gigabit Ethernet
switch that has the required number of ports. Virtual local area network (VLAN) can
also be used to isolate the two iSCSI networks, instead of a single switch.
Gigabit
Ethernet
switch
Host system
with two iSCSI
connectors
DS5020
Figure 61. Example of a single-host, multiple-port configuration
88 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide