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

Define about the stored procedure, Define about the Stored Procedure - ...

Define about the Stored Procedure - It's a set of T-SQL statements combined together to perform a single task formed by combining numerous small tasks. - When you essentiall

The concurrent transactions, The Concurrent Transactions  Almost every ...

The Concurrent Transactions  Almost every commercial DBMS support multi-user environment. Therefore, allowing multiple transactions to proceed concurrently. The DBMS must make

Operator precedence-data manipulation language, Operator Precedence The...

Operator Precedence The basic operators used in SQL are * /   - + Operators of the similar priority are evaluated From Left to right Parentheses are used to force priorit

How many levels can be viewed architecture of the database, How many levels...

How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.

Define tuple variable, Define tuple variable Tuple variable is a type o...

Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.

Designing the database schema , The domain that you will model in this assi...

The domain that you will model in this assignment is that of courses and students at a university. So as not to make the task too large and unspecified, you will here get a descrip

Explain composite attribute in sql, Explain Composite attribute in SQL ? ...

Explain Composite attribute in SQL ? Composite attribute: A composite attribute has many components, each of that is atomic or composite.

Explain mechanism of nested queries, Explain mechanism of nested queries? ...

Explain mechanism of nested queries? SQL gives a mechanism for nesting subqueries. A subquery is a select from where expression that is nested within one more query. A common u

Define upgrade and downgrade, Define upgrade and downgrade? It gives a ...

Define upgrade and downgrade? It gives a mechanism for conversion from shared lock to exclusive lock is called as upgrade. It gives a mechanism for conversion from exclusive

The result of the union operation between r1 and r2, The result of the UNIO...

The result of the UNION operation between R1 and R2 is a relation that includes? The result of the operation between R1 and R2 includes all the tuples of R1 and R2 which have c

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