Problem Of Operating Raid System - NEC Express5800 Series Maintenance Manual

Chapter 1 Maintenance
5.6

Problem of Operating RAID System

[?] Unable to rebuild solid state drive
Is the capacity of the solid state drive to be rebuilt enough?

→ Use a solid state drive with the same capacity as that of the faulty solid state drive.
Is the logical drive RAID0?

→ RAID0 cannot be rebuilt because it has no redundancy. Replace the failed solid state drive,
recreate the configuration information, initialize it, and recover the drive using backup data.
[?] Fails to automatically rebuild the solid state drive
Did you secure sufficient time for replacing the solid state drive (hot swap)?

→ To make auto-rebuild work, secure at least 90 seconds from when a solid state drive is removed
to when the drive is installed.
[?] Hard disk drive fails
→ Contact your sales representative.
[?] Unable to perform Consistency Check
Is the logical drive Critical or Degraded?

→ Replace the failed solid state drive with new one, and then perform Rebuild.
Is RAID0 configured for the logical drive?

→ RAID0 has no data redundancy, and therefore, Consistency Check is disabled in the RAID0
configuration.
[?] Cannot set Write-Back for Cache Mode
→ The current cache of RAID Controller is displayed on Virtual Disks – Properties – Policies –
Write. If an additional 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).
For the description of the Cache Mode, refer to Chapter 2 (4. RAID System Configuration).
[?] DISK LED flashes
DISK LED flashes frequently even while the solid state drive is not accessed.

→ When Patrol Read is running, the DISK LED flashes even if the solid state drive is not being
accessed. If SATA solid state drive is used, the DISK LED may stay on.
Express5800/B120f Maintenance Guide
5. Troubleshooting
35