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A Redundant Array of Independent Disks (RAID) is a method of configuring member drives to create high availability and high performance systems. The RAID level provides different degrees of redundancy and performance; it also determines the number of members in the array
The RAID level is what determines the relationship of the disks.
Level | Description | Drive count | Approximate array capacity | Redundancy |
---|---|---|---|---|
RAID 0 | RAID 0 combines two or more disks by stripping data across them. That chunks of data are written to each disk in the array alternately. |
1 - 8 | Drive count * Drive size | None |
RAID 1 | RAID 1 is a configuration that mirrors data between two or more disks. Everything written to the array is placed on each of the devices in the group, so each disk has a complete set of the available data. |
2 | Drive size | 1 |
Redundancy means how many drive failures the array can tolerate. In some circumstances, an array can tolerate more than 1 drive failure.
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