Host Mini-Hubs; Drive Mini-Hubs; Figure 4. Host Side And Drive Side Mini-Hub Ports (Back View) - IBM Netfinity FASt T500 User Reference

The following figure shows the host and drive mini-hub ports.
Host side mini-hubs
Controller B
Controller A
1
Host GBIC
mini-hub
ports

Figure 4. Host side and drive side mini-hub ports (back view)

For more information about connecting the controller unit and drive enclosures (also
referred to as expansion units) using the host and drive interface ports, refer to the IBM
Netfinity FAStT500 RAID Controller Enclosure Unit Installation Guide.

Host mini-hubs

There are up to four host side mini-hubs, two per controller (see
and 3 correspond to the top controller (Controller A) and mini-hubs 2 and 4 correspond to
the bottom controller (Controller B). Each pair of mini-hubs accommodates one host
channel. Each mini-hub provides host loop connectivity and self-diagnostic features. To
ensure redundancy, you must connect each host to a Controller A and Controller B mini-
hub.

Drive mini-hubs

The controller unit has four drive channels. Each channel accommodates one drive side
mini-hub (see
Controller B.
6 IBM Netfinity FAStT500 RAID Controller Enclosure Unit User's Reference
Controller A
Controller B
2 3
4
Figure 4). All mini-hubs on the drive side attach to both Controller A and
Drive side mini-hubs
4 3 2 1
Figure 4). Mini-hubs 1
Drive GBIC
mini-hub
ports