How Raid Disk Configuration Works and Information About Raid 0 , Raid 1 , Raid 5 , Raid 10

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RAID for Redundant Array of Inexpensive Disks. Raid is mainly used to backup volumes or partitions on multiple physical disks. Raid can be implemented with different technologies like soft raid or hard raid.

Soft RAID

Soft raid is implemented on operating system level and requires some tools and modules. Below is a tutorial about mdadm which is Linux software used to implement soft RAID.

http://www.poftut.com/raid-linux-mdadm/

RAID

Raid is generally implemented in hardware level in enterprise environments which makes created RAID more reliable.

RAID LEVEL 0

RAID LEVEL 0

RAID LEVEL 0

  • Minimum 2 disks
  • Performance because blocks are stripped
  • More disk more performance
  • No redundancy
  • Do not used for critical systems

RAID LEVEL 1

RAID LEVEL 1

RAID LEVEL 1

  • Minimum 2 disks
  • No performance gain because there is no striping or parity
  • Excellent redundancy because of two disk with same data

RAID LEVEL 5

RAID LEVEL 5

RAID LEVEL 5

  • Minimum 3 disks
  • Good performance because blocks are stripped
  • Good redundancy because one disk is used for parity
  • Good cost because provides performance and redundancy with 3 disks

RAID LEVEL 10 or 1+0

RAID LEVEL 10 or 1+0

RAID LEVEL 10 or 1+0

  • Minimum 4 disks
  • Called stripe of mirrors
  • Both RAID 1 and RAID 0 is chained together
  • Excellent redundancy
  • Excellent performance
  • Best solution for mission critical systems if cost  is not so important
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