IBM Midrange System DS4000 Series Hardware Manual page 101

Attention: If you do a controller replacement, make sure that the controller that you want
to replace is in offline mode or failed before you physically remove it. Using only the
Prepare for Removal function will not change the controller state.
Use the Prepare for Removal function in the DS Storage Manager Subsystem Management
window or refer to the applicable component replacement instructions for this case. Refer to
Chapter 7, "Advanced maintenance, troubleshooting, and diagnostics" on page 327 for
detailed information.
Note: Wait at least two minutes after you replace each component for the controller to
recognize the new component and update the LED status. If the SAA LED is turned on,
you must remove and replace the component in order to get the LED turned off.
In most cases when a single component fails, the Service Action Allowed status LED turns on
steadily when the Needs Attention status LED is turned on for the component.
Battery LEDs
Each DS5020 RAID controller has its own battery. There are three LED indicator lights on
each battery:
Service action allowed (blue) (see "Enclosure ID" on page 82 for details)
– Off: Normal status.
– On: Safe to remove.
Battery charging (green)
– On: Battery charged and ready.
– Blinking: Battery is charging.
– Off: Battery is faulted, discharged, or missing.
Needs attention or service action required (amber)
– Off: Normal status.
– On: Controller firmware or hardware requires attention.
Figure 3-60 shows the battery LEDs.
Battery charging
(Green)
Figure 3-60 Battery LEDs
Service action required
(Amber - Fault)
Chapter 3. IBM System Storage DS4000 and DS5000 hardware
Service action allowed
(Blue)
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