A storage system has plenty of storage space available. Which storage profile should a storage administrator use when both high performance and high reliability are required?
A. double-parity RAID
B. striped
C. mirrored
D. single-parity RAID, narrow stripes
Correct Answer: A
Explanation/Reference:
Explanation:
RAID in which each stripe contains two parity disks. As with triple mirroring, this yields high availability, as data remains available with the failure of any two disks. Double parity RAID is a higher capacity option than the mirroring options and is intended either for high-throughput sequential-access workloads (such as backup) or for storing large amounts of data with low random-read component.
Note: Triple mirrored
Data is triply mirrored, yielding a very highly reliable and high-performing system (for example, storage for a critical database). This configuration is intended for situations in which maximum performance and availability are required. Compared with a two-way mirror, a three-way mirror adds additional IOPS per stored block and higher level protection against failures.
Incorrect Answers:
B: Data is striped across disks, with no redundancy. While this maximizes both performance and capacity, a single disk failure will result in data loss. This configuration is not recommended. For pure streaming workloads, consider using Double parity RAID.
C: Data is mirrored, reducing capacity by half, but yielding a highly reliable and high-performing system. Recommended when space is considered ample, but performance is at a premium (for example, database storage).
D: RAID in which each stripe is kept to three data disks and a single parity disk. For situations in which single parity protection is acceptable, single parity RAID offers a much higher capacity option than simple mirroring. This higher capacity needs to be balanced against a lower random read capability than mirrored options. Single parity RAID can be considered for non-critical applications with a moderate random read component. For pure streaming workloads, give preference to the Double parity RAID option which has higher capacity and more throughput. References: https://docs.oracle.com/cd/E51475_01/html/E52872/goden.html
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