5. TroubleshootingExpress5800/R120d-1E, R120d-2E Maintenance Guide32Chapter 1 Maintenance5.6 When Operating a 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 theconfiguration 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 towhen the drive is installed.[?] The Hard Disk Drive failed→ Contact the maintenance service company with which you signed up or the dealer where you purchasedthe 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 RAID0configuration.[?] Cannot set Write-Back for Cache Mode→ The current cache of RAID Controller is displayed on Virtual Disks – Properties – Policies – Write. Ifan additional battery is faulty, is not connected, or insufficiently charged, the Cache Mode is changed toWThru (Write Through) even if you specify WBack (Write Back).For the description of the Cache Mode, refer to Chapter 2 (4. RAID System Configuration).
