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Chapter 13: Problem 11

What are the techniques used to improve performance of disks in RAID?

Short Answer

Expert verified
Techniques used to improve the performance of disks in RAID include data striping (used in RAID 0), disk mirroring (used in RAID 1), and striping with parity (used in RAID 5 and RAID 6). These techniques enhance performance by distributing read/write operations across multiple disks and providing redundancy data to prevent data loss in case of disk failure.

Step by step solution

01

Define RAID

RAID (Redundant Array of Independent Disks) is a storage technology that combines multiple disk drive components into a single logical unit. It aims at data redundancy, performance improvement and protection of data loss.
02

Discuss Data Striping

Data striping is a technique that involves dividing data into blocks and then spreading the data blocks across multiple storage devices in a RAID array. This can significantly enhance performance, particularly for larger files, as multiple disks can read/write data simultaneously. For instance, RAID 0 employs striping.
03

Discuss Disk Mirroring

Disk mirroring is another technique used to improve performance in RAID. It involves duplicating the same data on two or more disks. This redundancy allows for continuous operation even if one disk fails. It also allows for faster read operations as read requests can be distributed among the mirror disks. RAID 1 utilizes the disk mirroring method.
04

Discuss Disk Striping with Parity

Striping with parity is a technique used in some RAID levels (e.g., RAID 5 and RAID 6). Here, the data is striped across multiple disks, and redundancy is achieved via parity information distributed among the disks. This allows for improved read and write speeds and data recovery in case of disk failure.

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Most popular questions from this chapter

Suppose that we have an ordered file of fixed-length records and an unordered overflow file to handle insertion. Both files use unspanned records. Outline algorithms for insertion, deletion, and modification of a file record and for reorganizing the file. State any assumptions you make.

What are the reasons for having variable-length records? What types of separator characters are needed for each?

What characterizes the levels in RAID organization?

What are the components of a disk block address?

Discuss the techniques for record deletion.
See all solutions

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