Chapter 4: Subsystem Connection and Operation
Sample Topologies
4-5
4.3 Sample Topologies
The FC ports on the controller rear panel can be used to connect the
GALAXY to the hosts, and/or external devices. The subsystem will
automatically validate the dual-loop configuration, and the RAID controller
will activate the enclosure monitoring service accordingly.
NOTE:
Rather you are going to connect the GALAXY to hosts, or external
devices, be sure to have SFP transceivers and Fibre cables ready. You
may purchase the SFP transceivers and Fibre cables from your subsystem
vendor. See Appendix C for the available accessories list.
4.3.1 Sample Topology – Clustered Hosts
In the configuration shown in
Figure 4-1,
one (1) GALAXY subsystem is
connected to two (2) host computers. Data path redundancy makes sense
when the following configurations are available:
1.
These two computers are clustered.
2.
Cluster software is installed.
3.
The same storage volume(s) are made available on both host ports.
The surviving computer can access the array in the event of single
computer failure.
Figure 4-1: Connect GALAXY Subsystem to Dual Host
•
Connections:
The input ports on the subsystem, FC-CH0 and FC-
CH1, are connected to two separate host computers.
•
Redundant Data Paths:
In the configuration shown in
Figure 4-1
,
the data paths are redundant. If either of these data paths fails, I/O
traffic will be transmitted along the alternative path. If one of the
host computers fails, the second host computer that is connected to
the subsystem can resume the operation of the subsystem.
