Servicing Notes; Controller Status Indicator Lights - IBM TotalStorage DS4400 User Manual

Fault-B
Amber light indicates
controller fault.
Normal status: Off
Problem status: On
Power
Green light indicates that
power is on.
Normal status: On
Problem status: Off
Figure 33. Controller status indicator lights

Servicing notes

Consider the following when servicing the controllers in the DS4400 Storage Server:
v The DS4400 Storage Server supports two controller CRUs, which attach to hosts
v You can hot swap or replace a failed controller while the DS4400 Storage Server
v If cache mirroring is enabled in redundant controllers and one controller fails, the
v If you replace the controller CRU and still experience problems, the DS4400
v When a controller CRU fails, the fault light on the affected controller is lit. For
v The two controllers are automatically synchronized when you replace a failed
42
IBM TotalStorage DS4400 Fibre Channel Storage Server: User's Guide
Controller status
indicator lights
through Fibre Channel connections.
is in operation as long as the host has a Fibre Channel connection to the
functioning controller and is in a "passive" or "offline" status in the
storage-management software.
second controller assumes processing functions without data loss. However,
some or all data might be lost if cache mirroring is disabled and a failure occurs
before data is written from cache memory to disk.
Storage Server might have other defective components or connections. Check
the storage-management software for indications of other component failures.
more information about indicator lights, see "RAID controller indicator lights" on
page 29.
controller. The storage-management software automatically synchronizes the
firmware between the existing controller and the new controller.
Heartbeat
Green light indicates that the
controller is working.
Normal status: On (blinking)
Problem status: On
Status
(8 lights including the Heartbeat)
Green lights indicate controller
status.
Reset switch
Controller A
Controller B