Chapter 3: Subsystem Connection
DIP Switch
3-7
Figure 3-3: Host Ports Hubbed Together
IMPORTANT:
1.
One drawback of using the hub function is that the host ports
looped together may not be connected to the N_ports on a fabric
switch. When host ports are hubbed together, they are ideal for
connecting other RAID enclosures and direct-attached servers
with path redundancy while without the costs on expense of FC
switches.
2.
Another drawback is that if host ports are hubbed together, the
overall host port bandwidth is halved.
For example, the Channel 1 host ports on each controller feature
a 4Gb/s bandwidth and a total of 8Gb/s bandwidth from the host
ports on two controllers.
If host ports are hubbed together, all four “Channel 1” host ports
on bother controllers share a 4Gb/s bandwidth.
Enclosure ID
: For a RAID subsystem the default is “0” and needs not be
changed.
Shown below are the combinations of DIP switch mode settings:
