IBM System Storage Subsystem DS5020 - Manual (Page 115)

Fibre Channel host loop configurations
You must determine how the host systems will connect to the storage subsystem.
You can connect up to four host systems directly to the storage subsystem through
Fibre Channel host ports, or you can connect more than four hosts to the Fibre
Channel storage subsystem through switches. The illustrations in the following
sections show common host system configurations when you connect to the
DS5020 Fibre Channel host ports. See “iSCSI configurations” on page 87 for more
information about host connections through iSCSI.
Note: The DS5020 supports up to 128 partitions. Configuration upgrades are
available as upgrade options. Contact your IBM reseller or marketing
representative for more information.
Redundant Fibre Channel host loops
This section provides examples of DS5020 host Fibre Channel configurations.
DS5020 host Fibre Channel SAN configurations: This section provides the
following examples of DS5020 host Fibre Channel SAN configurations:
v Redundant host direct-attached configurations, as shown in Figure 56
v Single SAN fabric configuration, as shown in Figure 57 on page 86
v Dual SAN fabric configuration, as shown in Figure 58 on page 86
v Two storage subsystems in a dual SAN fabric configuration, as shown in
Figure 59 on page 87
v Two clusters, as shown in Figure 60 on page 87
Notes:
1. These configurations have host and drive path failover protection and provide
high availability.
2. The following illustrations do not accurately represent the controller locations or
port locations in the DS5020. The illustrations are for illustration purposes only.
Host system
with two host
adapters
DS5020
Host system
with two host
adapters
Host system
with two host
adapters
DS5020
Figure 56. Examples of redundant host direct attached Fibre Channel SAN configurations
Chapter 3. Cabling the storage subsystem 85