Chapter 4: Subsystem Connection and Operation
Subsystem Connection and Operation 4-9
Figure 4-4: Host Port Bandwidth when the Onboard Hub is Enabled or
Disabled
1. One drawback of using the hub function is that the host ports hubbed
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 without the costs on expensive 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