A technician is troubleshooting an enterprise virtualization server configured with a hardware RAID 5 array consisting of four hot-swappable SAS SSDs. The RAID management utility reports that the array status is degraded due to Disk 2 failing and going offline. Additionally, virtual machines hosted on the array are experiencing high write latency because the hardware RAID controller has automatically switched from write-back to write-through mode following a battery backup unit (BBU) fault alert. Which TWO of the following actions should the technician perform to restore array fault tolerance and optimal write performance without risking data loss?
- Hot-swap the failed SAS SSD in slot 2 with a spare drive of equal or greater capacity and initiate an array rebuild.Cevap
- Replace the faulty RAID controller battery backup unit (BBU) to safely re-enable write-back cache operation.Cevap
- CForce Disk 2 back online using the RAID management console and run a full low-level format on the drive.
- DBack up all virtual machines, break the degraded RAID 5 array, and reconfigure the drives as a RAID 0 array to eliminate rebuild overhead.
Cevap
The technician must hot-swap the failed SAS SSD in slot 2 with a compatible replacement drive to rebuild parity data, and replace the RAID controller's faulty battery backup unit (BBU) to safely re-enable write-back caching.
To fix a degraded RAID 5 array, the failed member drive must be physically replaced with a healthy drive of equal or greater capacity and rebuilt using existing parity information. To resolve write performance issues caused by a disabled controller cache, replacing the degraded battery backup unit (BBU) allows the controller to safely re-enable write-back cache without exposing cached data to power loss risks.
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RAID 5 Degradation and Controller Battery Backup Cache Protection