IBM TotalStorageFAStT900, User Manual

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interface ports are shown in Figure 17.
For more information about how to connect the FAStT900 Storage Server and drive
enclosures (also referred to as expansion units) by using the host and drive
interface ports, refer to the
IBM FAStT900 Fibre Channel Storage Server Installation
Guide .
Host interface ports
The FAStT900 Storage Server comes with host-side mini hubs 1 and 2 installed.
Each mini hub provides host loop connectivity and self-diagnostic features. Host
mini hubs connect to the controller in pairs. When fully configured, the FAStT900
Storage Server can accommodate four host-side mini hubs, two per controller. Mini
hubs 1 and 3 connect to the top controller (Controller A) and mini hubs 2 and 4
connect to the bottom controller (Controller B), as shown in Figure 18. To ensure
redundancy, you must connect each host to both controllers through the appropriate
mini hub.
Drive interface ports
The FAStT900 Storage Server comes with drive-side mini hubs 1 and 2 installed.
Each drive mini hub connects to Controller A and Controller B and represents a
single drive loop. The drive loops must be set up in pairs to support redundant drive
loop configurations (two data paths per drive enclosure). The maximum number of
drive expansion units can be connected per pair of redundant drive loops
depending on the IBM FAStT drive expansion unit models used. The two possible
Figure 17. FAStT900 Storage Server interface ports
Figure 18. Host-side mini-hub interface ports
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IBM TotalStorageFAStT900 Fibre Channel Storage Server: User’s Guide