NEC Express5800/R120g Maintenance Manual page 38

Chapter 1 Maintenance
[?] Cannot set Write-Back for Cache Mode
→ On Virtual Disks – Properties – Policies screen of Web BIOS, Default Write shows set value of cache
mode of RAID controller, and Current Write shows the current write policy. Accordingly, if battery is not
connected, failed, or insufficiently charged, indication of Current Write changes to Write Through even
if you specify Write Back with BBU for Default Write.
Indication of
Reason for Diff in Write
BBU not installed
BBU is failed
BBU is discharged
BBU in re-learn cycle
Reconstruction
If the battery is not found in spite of actions taken, the battery may be faulty.
Consult with your sales representative.
[?] Additional battery is not found or the following message appears in POST
The battery hardware is missing or malfunctioning,
or the battery is unplugged, or the battery could be
fully discharged. If you continue to boot the system,
the battery-backed cache will not function.
If battery is connected and has been allowed to charge
for 30 minutes and this message continues to appear,
then contact technical support for assistance.
Press 'D' to disable this warning (if your controller
does not have a battery.
Are the cable between the battery pack and battery board and the control cable between the battery board

and battery connector connected correctly?
→ Connect the cables correctly.
Is this message displayed after the battery is connected?

→ If the battery charging status is low, the battery is not found. If the battery is not found although 24 hours
has passed, restart the system once. If the battery is not found although the above action has been taken,
the additional battery may be faulty. Contact your sales representative.
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Displayed when battery is disconnected.
(1) Check if battery control cable (cable used to connect RAID controller with
battery) is properly connected.
→ Connect cable properly.
(2) Is it displayed immediately after the battery was connected?
→ The battery may not be found if it is insufficiently charged. If the battery
is not found even after 24 hours have elapsed, restart the server.
Displayed when battery is failed.
Contact your sales representative.
Displayed when battery voltage is low.
Check the cache mode (current value) about 12 hours later.
Displayed when battery is being refreshed.
Check cache mode (current value) about 12 hours later.
Displayed when battery is being reconstructed.
Check cache mode (current value) after reconstruction completes.
Express5800/R120g-2E, T120g Maintenance Guide
Action
5. Troubleshooting