A network-attached storage (NAS) appliance utilizing a six-drive RAID 6 array reports that Disk 3 has failed and gone offline. During a background diagnostic scan of the remaining array, Disk 5 triggers a critical S.M.A.R.T. alert for uncorrectable sector errors, although it remains online. To preserve data integrity and restore redundancy safely, which TWO of the following actions should the technician perform? (Select TWO).
- Immediately perform a full data backup of the storage volume to an isolated secondary system.Answer
- BFormat Disk 3 and Disk 5 simultaneously using host utilities to clear bad sector tables.
- Replace Disk 3 with a functional drive of identical or greater capacity and initiate an array rebuild.Answer
- DReconfigure the storage array from RAID 6 to RAID 0 to bypass parity checks on Disk 5.
Answer
The technician should immediately perform a complete volume backup to secondary storage and replace the offline Disk 3 with a new drive of equal or greater capacity to begin rebuilding array redundancy.
When managing a degraded array where an additional disk exhibits S.M.A.R.T. sector warnings, securing a secondary backup first prevents complete data loss should the second disk fail during rebuild reads. Replacing the failed drive then enables the storage system to reconstruct missing data blocks and re-establish fault tolerance.
Step-by-Step Solution
Key Concept
Degraded RAID 6 Recovery and Risk Mitigation with S.M.A.R.T. Drive Errors
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