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  2. Disk mirroring - Wikipedia

    en.wikipedia.org/wiki/Disk_mirroring

    In data storage, disk mirroring is the replication of logical disk volumes onto separate physical hard disks in real time to ensure continuous availability. It is most commonly used in RAID 1 . A mirrored volume is a complete logical representation of separate volume copies.

  3. 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.

  4. Nested RAID levels - Wikipedia

    en.wikipedia.org/wiki/Nested_RAID_levels

    RAID 01, also called RAID 0+1, is a RAID level using a mirror of stripes, achieving both replication and sharing of data between disks. [3] The usable capacity of a RAID 01 array is the same as in a RAID 1 array made of the same drives, in which one half of the drives is used to mirror the other half.

  5. Non-standard RAID levels - Wikipedia

    en.wikipedia.org/wiki/Non-standard_RAID_levels

    Under traditional RAID, an entire disk storage system of, say, 100 disks would be split into multiple arrays each of, say, 10 disks. By contrast, under declustered RAID, the entire storage system is used to make one array. Every data item is written twice, as in mirroring, but logically adjacent data and copies are spread arbitrarily.

  6. File synchronization - Wikipedia

    en.wikipedia.org/wiki/File_synchronization

    In one-way file synchronization, also called mirroring, updated files are copied from a source location to one or more target locations, but no files are copied back to the source location. In two-way file synchronization , updated files are copied in both directions, usually with the purpose of keeping the two locations identical to each other.

  7. List of DOS commands - Wikipedia

    en.wikipedia.org/wiki/List_of_DOS_commands

    The MIRROR command saves disk storage information that can be used to recover accidentally erased files. The command is available in MS-DOS version 5. It is available separately for versions 6.2 and later on Supplemental Disk. [1]

  8. 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 ...

  9. GEOM - Wikipedia

    en.wikipedia.org/wiki/GEOM

    For example, on top of the geom_mirror module an encryption module can be added, such as geom_eli to provide a mirrored and encrypted volume. Each module has both consumers and providers. A provider is the 'source' of the geom module, often a physical hard drive but sometimes a virtualized disk such as a memory disk. The geom module in turn ...