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RAID-Configuration

About

  • RAID stands for (Redundant Array of Independent Disks)
  • RAID is a storage(hardware) configuration methodology.
  • It helps prevent data loss by introducing redundancy or copies.1
  • It is similar to saving an additional copy of a file - but on a bigger scale.

Parity

RAID Monitoring

  1. Latency
  2. Capacity & Utilization
  3. Input/Output operations Per Second (IOPS)

Configuration Types

RAID 0 : Stripping

  • Data is not copied completely, but separated among two hard disks.
  • t provides speed, since there are two disk controllers.
  • But, if one hard disk fails, the system fails.
  • The probability of failure increases since data is not copied.

RAID 1: Mirroring

  • A full copy is stored in two disks.
  • If one disk fails, data can be retrieved from the second disk.

RAID 5: Striping w/ Parity

  • RAID5 requires at least 3 disks.
  • Most commonly used since it is fast, as well as more secure than RAID 1.
  • But data is not completely duplicated here.
  • Data is striped and shared with multiple disks.
  • Parity (extra some data to rebuild the data in the event of a disk failure) is also stored equally on all these drives.
  • The downside? An entire disk's worth of space is sued to store parity, less use-able space is available. Example: If we have 4 Hard Disks of 1TB each in a RAID 5 setup. 1TB will be used for parity, and 3 TB will be available for data storage.

RAID 6: Striping w/ 2x Parity2

RAID 10: Mirroring w/ Striping

  • Minimum of 4 disks are required.
  • Raid 1 and Raid 0 are combined.
  • If we have 4 Hard Disks of 1TB each, Disks A and B will be in RAID1 setup, Disks C and D will be in RAID1 setup. While both these groups will be in a RAID0 setup.
  • Raid 10 provides both the fault-tolerance of Raid 1 and the speed of Raid 0.
  • Downside? only 50% of the data can be used for storage. The 50% is for backup because of the Raid 1 configuration.

RAID 01: Striping w/ Mirroring

See Also

References

  1. What is RAID 0, 1, 5 & 10?, by PowerCert Animated Videos on YouTube.com (9 August 2015) ↩

  2. RAID Configurations, on manageengine.com (7 June 2024) ↩