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manual abstract
Item
LED
Indication
Green LED that indicates write-back cache
status. Slow flashing green LED indicates
5
standby power. Solid green LED indicates
cache is good with normal AC power ap-
plied.
1. Controller 1
2. Controller 2
Amber LED that indicates DIMM status. The
LED is off when DIMM status is good. Slow
Figure 1 Controller locations
flashing amber indicates cache/DIMMs are
6
.
being powered by battery (during AC
power loss). Solid amber indicates a DIMM
Verifying component failure
failure.
Use the following methods to verify component failure:
• Analyze any failure messages received. Fault monitoring software
Removing a controller
from HP provides a recommended solution.
• Check status using HP Command View EVA:
1.
In the navigation pane, select Storage system > Hardware >
CAUTION:
Controller Enclosure > Controller.
Verify which controller is being serviced. Removing the wrong
2.
The status is displayed in the Condition/State field. An opera-
controller can cause data loss.
tional state of (Failed) would indicate a fault that may require
a replacement.
3.
To help identify the correct controller, click Locate > Locate On.
Consider the following:
This causes the blue UID indicator to light on the controller
module at the rear of the controller enclosure.
• Replacement controllers do not have DIMM modules, therefore the
DIMMs from the controller being removed must be transferred to the
• Check the controller status LEDs as shown in Figure 2 and Table 1.
replacement controller.
• HP recommends that you replace the controller while the controller
enclosure is powered on to ensure the controller software on the re-
dundant controller is copied to the replaced controller.
IMPORTANT:
Do not insert the replacement controller while the system is
down. Doing so can disconnect the controller's write-back
cache, which will clear cache memory of possibly unsaved data.
Figure 2 Controller status LEDs
Further, do not install a replacement controller while the system
.
is powered off or halted; this can cause unpredictable XCS
Table 1 Controller status LEDs
controller software upgrades or downgrades.
Because a powered-off controller enclosure always starts with
Item
LED
Indication
the controller software version of the controller in slot 1, be
absolutely sure that the controller software of the controller in
Blue LED used to identify a specific control-
1
slot 1 matches that of the replacement controller. If you are
ler module within the enclosure.
replacing the controller in slot 1 in a powered-off controller
enclosure or the controller in slot 2 is halted and the controller
Controller health OK. Flashing green during
2
software versions do not match, this can lead to an inadvertent
boot. Solid green LED after boot.
controller software upgrade or downgrade of the array, and
potentially the loss of data when metadata is overwritten. If the
Flashing amber indicates a controller crash
controller software version of the operating controller is unknown
or the system is inoperative and attention
and the controller enclosure is powered off, HP recommends
is required. Solid amber indicates that the
that you start the array with only the operating controller
controller cannot reboot and should be re-
3
installed and verify the controller software version before
placed. If both the solid amber and solid
replacing the partner controller.
blue LEDs are lit, the controller has com-
pleted a warm removal procedure, and can
be safely swapped.
N/A (top
4
Not used.
right)
Page 2
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