Problems When Using Raid System - NEC Express5800 Series Maintenance Manual

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Chapter 1 Maintenance
5.6

Problems When Using RAID System

[?]
Unable to rebuild Hard Disk Drive
 Is the capacity of the Hard Disk Drive to be rebuilt enough?
Use a Hard Disk Drive with the same capacity as that of the faulty Hard Disk Drive.
 Is the Logical Drive RAID0?
RAID0 cannot be rebuilt because it has no redundancy. Replace the failed Hard Disk Drive, recreate the
configuration information, initialize it, and recover the drive using backup data.
[?]
Fails to automatically rebuild the Hard Disk Drive
 Did you secure sufficient time for replacing the Hard Disk Drive (hot swap)?
To make auto-rebuild work, secure at least 90 seconds from when a Hard Disk Drive is removed to
when the drive is installed.
[?]
The Hard Disk Drive failed
Contact the maintenance service company with which you signed up or the dealer where you purchased
the product.
[?]
Unable to perform Consistency Check
 Is the Logical Drive Critical or Degraded?
Replace the failed Hard Disk Drive with new one, and then perform Rebuild.
 Is the Logical Drive RAID0?
RAID0 has no data redundancy, and therefore, Consistency Check is disabled in the RAID0
configuration.
[?]
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 detected in spite of actions taken, the battery may be faulty.
Consult with your sales representative.
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/E120d-1 Maintenance Guide
Action
5. Troubleshooting
29

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