PC Philosophy-RAID

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RAID (Redundant Array of Inexpensive Disks)

Increasing performance, reliability and system safety were the main tasks in computing development. Mechanical devices like Hard disk, containing moving parts, are very frequent reason for system vulnerability. Safety of stored data, resulted technology developed to deal with such problems, technology well known as RAID. The revolutionary idea (for now) is to use multiple hard disks in the same system in two ways at first:

1. The system speed significantly increasing, by dividing data between multiple disks (different parts process at the same time)

2. The system reliability increases by writing the same information to multiple disks at once.

Actually, what does RAID imply? The answer is simple but the result could be incredible. RAID is a technology that uses multiple hard drives, joined in an array increasing the speed of data transfer, and at the same time providing instant data backup. There are several different implementations of RAID, from RAID 0 to RAID 53. RAID is operating in two ways:

Striping- Dividing data between the available drives in RAID array.

DATA

1

2

3

4

5

6

1 2 3 4 5 6 7 8 HDD1 HDD2

Mirroring- Duplicating data by the controller on multiple drives in the array at once.

DATA

1

2

3

4

5

6

1 1 2 2 3 3 4 4 HDD1 HDD2

RAID 0+1 Striped array with mirroring-combines the best features of RAID and RAID 1. You need four physical drives (minimum).

Important: Multiple hard drives are linked together as a single ‘logical’ hard drive. ‘Logical’ hard drive must be connected to one or more hardware controllers or be attached to computer containing RAID capable OS, such us

Windows XP professional.

To be continued…

Setup software RAID in Windows XP

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