RAIDtallennustapaa

RAID (Redundant Array of Independent Disks) is a data storage virtualization technology that combines multiple physical disk drives into one or more logical units for the purposes of data redundancy, performance improvement, or both. Different RAID levels offer varying trade-offs between these aspects.

RAID 0, also known as striping, improves performance by dividing data into blocks and writing them across multiple disks simultaneously. However, it offers no redundancy, meaning the failure of a single disk will result in the loss of all data.

RAID 1, or mirroring, provides redundancy by writing identical data to two or more disks. If one disk fails, the data can still be accessed from the other. This level offers high fault tolerance but at the cost of capacity, as only the capacity of a single disk is effectively usable.

RAID 5 employs block-level striping with distributed parity. It distributes parity information across all drives, allowing for the reconstruction of data if one drive fails. RAID 5 offers a good balance of performance, capacity, and redundancy, making it a popular choice for many applications.

RAID 6 is similar to RAID 5 but uses two independent distributed parity checks, providing even greater fault tolerance by allowing for the failure of up to two disks without data loss. This comes at the expense of some performance and capacity compared to RAID 5.

RAID 10, also known as RAID 1+0, combines mirroring and striping. It mirrors pairs of disks and then stripes data across these mirrored pairs, offering both high performance and good redundancy. This configuration requires a minimum of four disks.