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RAID1 vs. RAID5

RAID 1 Array

This article will highlight the differences between RAID 1 and RAID 5 implementations and different pros and cons which are associated with them. RAID or Redundant Array of Independent Disks is a technique of storing data which is very common these days. We use several types of storage systems like RAID 0, RAID 1, or RAID 5 to present data redundancy which is required in case of disaster recovery, e.g., hard drive crash, hardware failure etc.

RAID 1 is a collection of hard drives which is used for creating an immaculate clone of the data present in two or more disks. These set of hard drives are called as Raid array. RAID 1 requires a minimum of two drives that should be of the same size. This is generally done for backing up the data in multiple hard drives. This type of RAID is also termed as mirroring.

RAID 1 writes same data on to two separate hard discs so that in case one drive malfunctions the other drive will take up as the main active drive with effectively zero downtime. This system is also known as Raid data recovery or RAID recovery.

Advantages of using RAID 1 system:

  • This type of RAID implementation is convenient to set up.
  • This provides full proof fault tolerance facility as downtime is not there.
  • This also requires minimum hardware resource requirement as it can be implemented using only two hard drives.
  • Overhead is minimal as parity bit is not generated for this type of RAID implementation.

Disadvantages of using RAID 1 system:

  • Degraded data reading performance is noticeable.
  • Cost of maintenance is high as redundant drives are required.
  • Generally not recommended for backing up large amounts of data.

RAID 5 generally provides with redundant fault tolerance as in RAID 1 along with parity bit distribution among the different drives. This RAID is implemented by combining both Striping and setting up of a dedicated parity block for each drive. They do this by storing data across all hard drives equally.

Parity is a specialized form of data generated when data is written to the array which enables the RAID to rebuild a whole disk if one drive fails. This RAID option operates by striping the data across all the disks except one, and using that one to store parity data.

Advantages of using RAID 5 recovery systems:

  • Data reading performance is very fast as compared with RAID 1.
  • This RAID implementation is able to sustain single disk failure without any loss to data.

Disadvantages of using RAID 5 recovery systems:

  • Writing data speeds are comparatively slower since parity is calculated during this procedure which is contrary to RAID 1.
  • At least three disk drives are required for setting up this type of RAID. So hardware requirement is more compared to RAID 1.
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