NEC Express5800 Series Maintenance Manual page 34

Chapter 1 Maintenance
[?] Cannot set Write-Back for Cache Mode
→ The current cache mode of RAID Controller is displayed on Virtual Disks → Properties →
Policies → Write.
If an extra battery is faulty, is not connected, or insufficiently charged, the Cache Mode is changed
to WThru (Write Through) even if you specify WBack (Write Back).
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 detected in spite of actions taken, the battery may be faulty.
Consult with your sales representative.
[?] Additional battery is not recognized or the following message is displayed 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 may not be recognized. If the battery is not
recognized although 24 hours has passed, restart the system once.
If the battery is not recognized although the above action has been taken, the additional battery
may be faulty. Contact the maintenance service company with which you signed up or the dealer
where you purchased the product.
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Indication of
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 detected if it is insufficiently charged. If the
battery is not detected 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/E120e-M Maintenance Guide
Action
5. Troubleshooting