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Chapter 3. Replacing controller unit components 49
Servicing notes
Consider the following when servicing mini-hubs:
• You can hot swap (replace) a failed mini-hub while the controller unit is in operation.
• Four indicator lights provide status information. If a mini-hub fails, the interface fault
and the bypass indicator lights on the mini-hub glow and the loop good indicator light
is off. For more information about indicator lights, see
"Checking the indicator lights"
on page 15 .
• If you replace the mini-hub and the GBICs in them and still experience problems, the
controller unit might have defective components or connections. Check the storage-
management software for indications of other component failures.
For more information, see "Fibre Channel connections" on page 3 and "Interface ports" on
page 5 .
Replacing a failed mini-hub
When instructed by the storage-management software, replace a mini-hub. Use this
procedure to replace either a failed host-side or drive-side mini-hub.
Attention: To prevent possible data loss, do not pull cables from a mini-hub that has not
failed.
1 On the mini-hub that has failed, remove the fiber-optic cables from the GBICs; then,
replace the protective caps on the cables.
Note: If you are using IBM GBICs, you must remove the fiber-optic cable from the
GBIC before you can remove the GBIC from the mini-hub port.
For proper handling of fiber-optic cables, see "Fibre Channel connections" on page 3 .
GBIC
Fiber-optic
cable