The statement that RAID 0 supports reconstruction is incorrect. RAID 0, known as striping, improves performance by distributing data across multiple disks but provides no data redundancy. If a single disk in a RAID 0 array fails, all data on the array is lost and cannot be rebuilt or reconstructed. In contrast, RAID levels 1, 3, 5, 6, and 10 all include redundancy mechanisms (mirroring or parity) that allow the array to be reconstructed onto a new disk after a drive failure, ensuring data availability.

B. A hot spare disk is a standby disk that can automatically replace a failed disk, but reconstruction can also be initiated manually after an administrator physically replaces the failed drive.

C. The reconstruction process involves intensive read operations on the surviving disks and write operations on the new disk, which competes for I/O resources and degrades the overall performance of the RAID group.

D. Redundant RAID levels are designed for high availability. During reconstruction, the array operates in a degraded state but remains online and continues to serve I/O requests, thus not interrupting business operations.

1. Huawei

"HCIA-Storage V5.0 Training Material

" Document Version 1.00

2021.

Section 2.2.2 RAID Levels: This section details the characteristics of different RAID levels. For RAID 0

it explicitly states

"RAID 0 does not provide data redundancy. If a member disk is damaged

data on the RAID group is lost." (Page 39).

Section 2.2.4 RAID Hot Spare: This section explains

"A hot spare disk is a spare disk in a storage system. When a member disk in a RAID group fails

the hot spare disk can automatically replace the faulty disk... If no hot spare disk is available

the faulty disk must be replaced manually." (Page 51).

Section 2.2.5 Data Reconstruction: This section notes

"During data reconstruction

the RAID group can still carry services

but its performance deteriorates." (Page 52).

2. Patterson

D. A.

Gibson

G.

& Katz

R. H. (1988). A case for redundant arrays of inexpensive disks (RAID). SIGMOD '88: Proceedings of the 1988 ACM SIGMOD international conference on Management of data

109–116.

Section 3

"The Five Levels of RAIDs": The foundational paper on RAID defines Level 0 as non-redundant striping

stating it has the "worst reliability" as the mean time to failure is the sum of the failure rates of all disks. This inherently means it cannot be reconstructed. (Page 112).