Describe the different raid levels, Database Management System

Assignment Help:

Describe the different RAID levels.  Discuss the choices of the different RAID levels for different applications.        

 Ans:   There are several combinations of these approaches giving different types of trade offs of protection against data loss, capacity, and speed. RAID levels 0, 1, and 5 are the most generally found, and cover most needs.

1. RAID 0 (striped disks) distributes data across various disks in a way that gives enhanced speed and full capacity, although all data on all disks will be lost if any one disk fails. 

2. RAID 1 (mirrored disks) could be explained as a backup solution, by using two (possibly more) disks that each store the same data so that data is not lost so long as one disk survives. Total capacity of the array is just only the capacity of a single disk. The failure of the one drive, in the event of a software or hardware malfunction, does not raise the chance of a failure nor decrease the reliability of the remaining drives (second, third, etc).

3. RAID 2 It employs memory style redundancy by using Hamming codes, which consist of parity bits for distinct overlapping subsets of components.

4. RAID 3 It employs a single parity disk relying on the disk controller to figure out that disk has failed.

5. RAID 4 It employes block-level data striping.

6. RAID 5 (striped disks with parity) combines three or more disks in a way which protects data against loss of any one disk; the storage capacity of the array is decreased by one disk. 

7. RAID 6 (less common) can recover from the loss of two disks by P + Q redundancy scheme by using Reed- Adoman codes.


Related Discussions:- Describe the different raid levels

Illustrate the view of software architecture, Illustrate the view of softwa...

Illustrate the view of software architecture A model is a semantically closed abstraction of system composes of elements. It can be visualized using any of the following five v

What are the advantages of embedded query language, What are the advantages...

What are the advantages of embedded query language? Give an example of an embedded SQL query. Embedded query language - SQL could be implemented within two ways. It can be us

Briefly explain the state diagram by taking one example, Briefly explain th...

Briefly explain the state diagram by taking one example. State Diagram - An object can be given a sequence of input instructions. The state of the object can vary depending u

FIELDS, 4. Describe three ways to handle missing field values

4. Describe three ways to handle missing field values

What is the meaning of redundant associations, Adding Redundant Association...

Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a

Need some database of usa and uk, I want Database Of United Kingdom with Cr...

I want Database Of United Kingdom with Criteria of:\r\n\r\n1). Name, Number, City, State, Postal Code, Address, Email id, DOB.\r\n\r\n2). Unsecure Debts only adds Credit Card Payme

Fundamental operations that are regular to mysql programs, What are the thr...

What are the three fundamental operations that are regular to MySQL Programs? a) Establishing a connection to the MySQL server b) Choosing a database. c) Disconnecting fr

Computing the closure of a set of functional dependency, What is meant by c...

What is meant by computing the closure of a set of functional dependency? The closure of F denoted by F + is the set of functional dependencies logically implied by F.

1) Information about a bank is about customer, 1) Information a...

1) Information about a bank is about customers and their account. Customer has a name, address which consists of house number, area and city, and one or more phone numbers. Ac

Provide the steps involved in ethical analysis, Question : Mr. Smith Ha...

Question : Mr. Smith Harry has a car manufacturing company which has recently integrated management information system. He wishes to obtain more information on ethics and socia

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd