Definition of RAID

Definition of RAID

Redundant Array of Independent Disks (RAID) is a virtual disk technology that combines multiple physical drives into one unit. RAID can create redundancy, improve performance, or do both.

RAID should not be considered a replacement for backing up your data. If critical data is going onto a RAID array, it should be backed up to another physical drive or logical set of drives.

The following are terms that are normally used in connection with RAID:

·         Striping: data is split between multiple disks.

·         Mirroring: data is mirrored between multiple disks.

·         Parity: also referred to as a checksum. Parity is a calculated value used to mathematically rebuild data.

Different RAID levels exist for different application requirements.

Types of Raid:-

·     👉    RAID 0– striping.

·     👉    RAID 1 – mirroring.

·     👉    RAID 5 – striping with parity.

·     👉    RAID 6 – striping with double parity.

·      👉   RAID 10(1+0) – combining mirroring and striping.