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FAQ

What is RAID and difference of each RAID mode?

RAID Storage, also known as Redundant Array of Independent Disks, is a storage technology that distributes data across multiple drives in a single system. It is represented by various configurations denoted by numbers, such as RAID 0, RAID 1, RAID 5, or RAID 6. Each RAID type offers distinct advantages to users, such as improved performance, higher fault tolerance, or a blend of both, depending on how it manages the writing and distribution of data.

DIGIEVER NVR provides 6 RAID modes: Linear, RAID0, RAID1, RAID5, RAID6, and RAID 10. The introduction of each RAID mode is in the below table.

Mode HDD Fault Tolerance Introduction
Big Drive
(Linear)		 0 Big Drive is a collection of hard disk drives and does not provide any RAID protection. The data are written to the disks continuously.
Performance
(RAID 0)		 0 RAID0 is one larger volume with 2 or more hard disk drives. The data are written to the hard disk drives without any parity information. The total storage capacity is the sum of all hard disk drives.
Fault Tolerant
(RAID 1)		 1 2 hard disk drives are required to create a RAID1 array. RAID1 can provide disk mirroring by duplicating the data between two hard disk drives.
Fault Tolerant
(RAID 5)		 1 A minimum of 3 hard disk drives is required to create RAID5. The data are striped in all hard drives in a RAID5 array and the parity information is stored in each drive. If a hard disk drive fails, the array enters degraded mode. The data can be rebuilt from other member drives after installing a new drive to replace the failed one.
Fault Tolerant
(RAID 6)		 2 To have the best performance, a minimum of 4 hard disk drives is required to create RAID6. The data are striped in all hard drives in a RAID6 array and the parity information is stored in each drive. It tolerates failure of two hard drives. The data can be rebuilt from other member drives after installing a new drive to replace the failed one.
Fault Tolerant
(Raid10)		 1 Data are written in stripes across primary disks that have been mirrored to the secondary disks. A typical RAID 10 configuration consists of four drives, two for striping and two for mirroring.