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  2. Redundant Array of Inexpensive Servers - Wikipedia

    en.wikipedia.org/wiki/Redundant_Array_of...

    A Redundant Array of Inexpensive Servers (RAIS) or Redundant Array of Independent Nodes (RAIN) is the use of multiple servers to maintain service if one server fails. This is similar in concept to how RAID turns a cluster of ordinary disks into a single block device.

  3. RAID - Wikipedia

    en.wikipedia.org/wiki/RAID

    RAID (/ r eɪ d /; redundant array of inexpensive disks or redundant array of independent disks) [1] [2] is a data storage virtualization technology that combines multiple physical data storage components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

  4. Standard RAID levels - Wikipedia

    en.wikipedia.org/wiki/Standard_RAID_levels

    Diagram of a RAID 1 setup. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks.This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk.

  5. Nested RAID levels - Wikipedia

    en.wikipedia.org/wiki/Nested_RAID_levels

    Nested RAID levels, also known as hybrid RAID, combine two or more of the standard RAID levels (where "RAID" stands for "redundant array of independent disks" or "redundant array of inexpensive disks") to gain performance, additional redundancy or both, as a result of combining properties of different standard RAID layouts. [1] [2]

  6. Intel Rapid Storage Technology - Wikipedia

    en.wikipedia.org/wiki/Intel_Rapid_Storage_Technology

    Like all RAID (Redundant Array of Independent Disks), Intel RST RAID employs two or more physical hard disks which the operating system will treat as a single disk, in order to increase redundancy which avoids data loss (except RAID 0), and/or to increase the speed at which data is written to and/or read from a disk.

  7. Non-standard RAID levels - Wikipedia

    en.wikipedia.org/wiki/Non-standard_RAID_levels

    It uniformly spreads or declusters user data, redundancy information, and spare space across all the disks of a declustered array. Under traditional RAID, an entire disk storage system of, say, 100 disks would be split into multiple arrays each of, say, 10 disks.

  8. Disk mirroring - Wikipedia

    en.wikipedia.org/wiki/Disk_mirroring

    Replication is enabled via microcode on the disk array controller or via server software. It is typically a proprietary solution, not compatible between various data storage device vendors. Mirroring is typically only synchronous. Synchronous writing typically achieves a recovery point objective (RPO) of zero lost data. Asynchronous replication ...

  9. Degraded mode - Wikipedia

    en.wikipedia.org/wiki/Degraded_mode

    When a RAID array experiences the failure of one or more disks, it can enter degraded mode, [1] a fallback mode that generally allows the continued usage of the array, but either loses the performance boosts of the RAID technique (such as a RAID-1 mirror across two disks when one of them fails; performance will fall back to that of a normal ...