Product specifications

Chapter 4: Subsystem Connection and Operation
In the example shown in Figure 4-2, one of the SCSI port is connected to a
single host computer.
4.2.2 Dual Hosts
Figure 4-3: Dual Host Connection
In the example shown in Figure 4-3, the two (2) SCSI ports on the
FALCON II are connected to two (2) different host computers and an
Ethernet cable connects both computers to each other. This configuration
provides both path and host computer redundancy. If one of the host
channels becomes disconnected for some reason, or the cable connecting
one of the host ports to the host computer is damaged, the second path
can transmit data from the subsystem to the host computer. Similarly, in
the clustered hosts configuration, the same array can be accessed through
different data paths and downtime will be minimized.
NOTE:
To create dual redundant data paths on the host side, it is necessary to
install third-party failover software on the host computer.
4.3 Daisy Chain
4.3.1 Daisy Chain Topology
The FALCON II offers the flexibility to daisy chain additional
FALCON II subsystems to meet increasing storage needs. In a daisy
chain topology, the FALCON II can be connected to each other. The IN
ports on the first subsystem are both connected to separate SCSI-320 host
computers. The OUT ports on the first subsystem are connected to the IN
ports on the second subsystem. This process is repeated for the third
subsystem.
Daisy Chain
4-3