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Replacing a mini hub
Attention: Before you replace a mini hub, consider the following factors:
v You can hot swap (replace) a failed mini hub while the DS4500 Storage
Subsystem is in operation.
v There are four LEDs that provide status information. If a mini hub fails, the
interface fault and the bypass LEDs on the mini hub are lit and the loop good
LED is off. For more information about LEDs, see “Mini hub LEDs” on page 134.
v If you replace the mini hub and its SFP modules and still experience problems,
the DS4500 might have defective components or connections. Check the
storage-management software for indications of other component failures.
For
more information, see “Redundant drive loop cabling overview” on page 76 and
“Types of interface ports” on page 48.
When instructed by the storage-management software, replace a failed mini hub
(host-side and drive-side) by using the following procedure:
Attention: To prevent possible data loss, do not remove cables from a mini hub
that has not failed.
Note:
You must remove the fiber-optic cable from the SFP module before you can
remove the SFP module from the mini-hub port.
1. On the mini hub that has failed, remove the fiber-optic cables from the SFP
modules, as shown in Figure 108.
For proper handling of fiber-optic cables, see “Handling fiber-optic cables” on
page 50.
O
U
T
!
Mini hub
Host mini-hub
ports
SFP module
SFP module
Fiber-optic
interface cable
Drive mini-hub
ports
Captive screw
GS000060
Figure 108. Removing the fiber-optic cable from the SFP module
Chapter 5. Replacing components 159