Types of RAID (Redundunt Array of Inexpensive Disks); HDD space required for configuration of RAID

A. Raid is a data storage method that includes a serial combination of several disks into one logical unit. There are different levels (5) of raid. This post will explain each raid level.

Raid level 0/ (striping); normally used to provide high disk performance provides making the level result in higher throughput, since no data is stored performance of the level is good, but disk failure may result in data loss. Raid0 requires an 80 GB hadrdisk

Raid level 1/ (mirroring); referred to the mirroring level provides redundancy by duplicating the data stored on the first drive to the subsequent drive so that if any drive failure occurs no data loss occurs. The downside is the cost per megabyte is high as that of single a drive as two drives are needed. If you have and 80 gb disk, configuring Raid level 1 plus mirroring capacity will use a disk capacity of 160GB

English: RAID 2 with seven disks and each grou...

English: RAID 2 with seven disks and each group of bits (orange, yellow, green, and blue) on disks 0-3 have three parity bits on disks 4-6 Category:RAID (Photo credit: Wikipedia)

Raid level 3/ (byte-level stripping); stripes data at a byte level across several drives with parity stored on one drive. The raid level required computers with good hardware performance. Most current PCs come with this RAID by default. It is possible to rebuild the data from the other disks if one disk fails. If two disks fail, a complete data loss occurs. RAID level 3 performances are lower than RAID level 5. The cost per megabyte is lower than RAID 1.

English: RAID 3 with four disks (disk 0, 1, 2,...

English: RAID 3 with four disks (disk 0, 1, 2, and 3) two 6-byte blocks, A & B, shown with their two bytes of parity on disk 3 (Photo credit: Wikipedia)

RAID Level 5 stripes data a block level in multiple drives and distributes parity connected in series a among the drives. RAID 5 does not devote any single disk in its configuration to parity. The performance of this raid level tends to be lower than other RAID types as the stored data is distributed on each drive.

English: RAID 5 with these four disks (disk 0,...

English: RAID 5 with these four disks (disk 0, 1, 2, and 3) and each group of blocks (orange, yellow, green, and blue) have a distributed parity block that is distributed across the four disks. (Photo credit: Wikipedia)

RAID 0+1 or RAID 10 is a RAID configuration Levels that deploys multiple RAID1 (mirrored) sets into one array that eliminates the overhead and delay of parity. This level array offers high data transfer advantages of striped arrays and increased data accessibility (reads). System performance in this raid level tends to be faster since data to is not rebuild but copied from the mirrored sets.

RAID 0+5 or RAID 50 is a combination of RAID levels that utilizes multiple RAID 5 sets striped in a single array. Though this disk tends to have a low performance after its rebuild, its write performance features is superior to the earlier RAID configurations.

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