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Mini hubs
The mini hubs are located on the back of the FAStT900 Storage Server (see
Figure 51 on page 59). A mini hub is a single, removable unit that provides the Fibre
Channel interface between a FAStT900 Storage Server and hosts or drives. The
back of the FAStT900 Storage Server can accommodate eight mini hubs: up to four
host-side and up to four drive-side mini hubs. Each mini hub has two ports. An SFP
module is installed in a mini-hub port; then, a fiber-optic interface cable is
connected into the SFP module. For more information, see "Fibre Channel
connections" on page 3 and "Small Form-Factor Pluggable (SFP) modules" on
page 53.
Servicing notes
Consider the following factors when you service mini hubs:
v You can hot swap (replace) a failed mini hub while the FAStT900 Storage Server
v Four indicator lights provide status information. If a mini hub fails, the interface
v If you replace the mini hub and the SFP modules in them and still experience
For more information, see "Fibre Channel connections" on page 3 and "Types of
interface ports" on page 11.
Replacing a failed mini hub
When instructed by the storage-management software, replace a mini hub. Use the
following procedure to replace either a failed host-side or drive-side mini hub.
Attention:
that has not failed.
Note: You must remove the fiber-optic cable from the SFP module before you can
1. On the mini hub that has failed, remove the fiber-optic cables from the SFP
is in operation.
fault and the bypass indicator lights on the mini hub are lit and the loop good
indicator light is off. For more information about indicator lights, see "Mini-hub
indicator lights" on page 26.
problems, the FAStT900 Storage Server might have defective components or
connections. Check the storage-management software for indications of other
component failures.
To prevent possible data loss, do not remove cables from a mini hub
remove the SFP module from the mini-hub port.
modules, as shown in Figure 50 on page 58.
For proper handling of fiber-optic cables, see "Handling fiber-optic cables" on
page 4.
Chapter 3. Replacing the FAStT900 Storage Server components
57
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