What do you understand by raid, Database Management System

Assignment Help:

What do you understand by RAID? Explain RAID Level 4 and Level5?

RAID - It is stands for Redundant Array of Inexpensive Disks (as named by the inventor), or alternatively Redundant Array of Independent Disks (a less relative name, and therefore now the commonly accepted one) - is a technology which employs the simultaneous use of two or more hard disk drives to achieve greater stages of performance, reliability, and/or larger data volume sizes.

RAID Level 4: In this setup, files can be distributed among multiple disks. Each disk operates independently that permits I/O requests to be performed in parallel, by data transfer speeds can suffer due to the kind of parity. The error detection is achieved through dedicated parity and is stored within a separate, single disk unit.

RAID Level 5: Distributed parity needs all drives but one to be present to operate; drive failure needs replacement, but the array is not destroyed through a single drive failure. Upon drive failure, any subsequent reads can be computed from the distributed parity such in which the drive failure is masked from the end user. The array will have data loss in the event of a second drive failure and is vulnerable until the data in which was on the failed drive is rebuilt onto a replacement drive


Related Discussions:- What do you understand by raid

What are the desirable properties of a decomposition, Define What are the d...

Define What are the desirable properties of a decomposition Ans: What are the desirable properties of decomposition - dependency preserving.  Because Lossless join and dependen

What is nested trigger, What is Nested Trigger? A trigger can also havi...

What is Nested Trigger? A trigger can also having INSERT, UPDATE and DELETE logic within itself, so when the trigger is fired because of data modification it can also cause ano

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.

Many-to-many relationship, For each m:n relationship type R, we make a new ...

For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att

Answer, what is database management system? & why it is required?

what is database management system? & why it is required?

What is called a query -execution engine, What is called a query -execution...

What is called a query -execution engine? The query implementation engine takes a query evaluation plan, implements that plan, and returns the answers to the query.

Define data model, Define data model? A data model is a collection of c...

Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.

Accounting and external reporting, List the internal controls that should b...

List the internal controls that should be in effect solely because a EDP system is employed, classifing them as (1) Those controls pertaining to input of information and (2) All ot

What function divides one numeric expression, What function divides one num...

What function divides one numeric expression by another and returns the remainder? MOD function divides one numeric expression by another and returns the remainder.

What are the three data anomalies, What are the three data anomalies that a...

What are the three data anomalies that are likely to occur as a result of data redundancy?  Can data redundancy be completely eliminated in database approach?  Why or why not? A

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