DEA-1TT5 RAID and Data Protection 2

Question 1

What happens to a RAID 5 array when a disk fails?

Accepted Answer

The array operates in a degraded mode using parity to reconstruct the missing data on reads

Answer

Data is immediately lost and the array goes offline

Answer

The array automatically shifts to RAID 1

Answer

All remaining disks mirror the lost data instantly

Question 2

What is 'RAID rebuild' and why can it be risky?

Accepted Answer

Reconstructing a failed disk's data onto a replacement disk, which stresses remaining drives and risks a second failure

Answer

Reconfiguring RAID levels, which risks overwriting user data

Answer

Upgrading controller firmware while data is online

Answer

Moving RAID sets between storage arrays

Question 3

Which RAID level mirrors data across two disks, providing full redundancy with 50% usable capacity?

Accepted Answer

RAID 1

Answer

RAID 0

Answer

RAID 5

Answer

RAID 6

Question 4

What is 'copyback' in a RAID context?

Accepted Answer

Migrating rebuilt data from a hot spare back to a new permanent replacement disk

Answer

Copying data from cache back to disk after a write

Answer

Backing up data from the primary to a secondary array

Answer

Reverting a RAID configuration to a previous state

Question 5

How many minimum disks are required to implement RAID 5?

Accepted Answer

3

Answer

2

Answer

4

Answer

5

Question 6

What does 'write hole' refer to in RAID 5 environments?

Accepted Answer

A data consistency issue where a system crash during a write leaves data and parity out of sync

Answer

A physical hole drilled in the disk platter during manufacturing

Answer

An unallocated region of the disk not included in any RAID set

Answer

A performance bottleneck caused by excessive parity calculations