A systems administrator swapped a failed hard drive on a server with a RAID 5 array. During the RAID resynchronization, a second hard drive failed. Which of the following actions will make the server fully operational?
D. Restore the server from backup.
With two hard drives failed on a RAID 5 array, the server will not be fully operational until the data is restored from a backup. RAID 5 arrays are designed to tolerate a single drive failure, but if a second drive fails during the resynchronization process, the array will be unable to rebuild and the data will be lost.
RAID 0 provides striping without parity or mirroring. Minimum Drives: 2. Data is distributed across multiple drives for improved performance, but there is no redundancy. If one drive fails, all data in the array is lost.
RAID 1 provides mirroring without striping or parity. Minimum Drives: 2. Data is duplicated across multiple drives, providing redundancy. If one drive fails, data remains accessible from the mirrored drive.
RAID 5 uses block-level striping with distributed parity. Minimum Drives: 3. Data and parity information are distributed across all drives in the array. RAID 5 can tolerate the failure of one drive without data loss.
RAID 10 combines mirroring and striping. Minimum Drives: 4. Data is mirrored across pairs of drives, and then the mirrored sets are striped for performance.
RAID 6 uses dual parity for fault tolerance. Minimum Drives: 4. It can withstand the failure of up to two drives without data loss. RAID 6 provides greater fault tolerance than RAID 5 but has slightly lower performance and higher storage overhead due to the additional parity information.
D. Restore the server from backup.
While it's true that RAID 5 arrays can tolerate a single drive failure, they become vulnerable to data loss if a second drive fails before the array has finished rebuilding after the first failure.
With two hard drives failed in a RAID 5 array during the resynchronization process, the array would be unable to rebuild, resulting in data loss.
Restoring the server from backup is necessary to recover the lost data and make the server fully operational again.
I think they are confusing RAID-5 with RAID-6.
I personally know resync will not work on RAID-5 with two failed drives ....it happened on my home RAID-5 NAS. The difference is I had no backups, and yes, it sucks to be me.
As long as the RAID5 array is in the rebuild process it will be in a degraded state. The failure of a drive in said array while it is in a degraded state will render the data lost. D is the correct answer.
C. Swap the failed hard drive with a fresh one.
Raid 5 can only survive one failed drive.
I don't think it's D as it doesn't change the fact that you have a failed drive.
If a second disk in a RAID level 5 disk array fails, you must replace the failed disks, then delete and recreate the disk array. You must then recreate the file systems on the disk array and copy data to the restored disk array from your backup media.
Regardless of how many drives are in use, a RAID 5 array only allows for recovery in the event that just one disk at a time fails.
Yeah if two drives fail in RAID5, aren't you done for? People go for RAID6 now partly because of this.
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