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RAID 1:
Every read and write is actually carried out in parallel across 2 disk drives in a RAID 1
array system. The mirrored (backup) copy of the data can reside on the same disk or on
a second redundant drive in the array. RAID 1 provides a hot-standby copy of data if
the active volume or drive is corrupted or becomes unavailable because of a hardware
failure.
RAID techniques can be applied for high-availability solutions, or as a form of
automatic backup that eliminates tedious manual backups to more expensive and less
reliable media.
Features and Benefits
- Drives: Minimum 2, and maximum is 2.
- Uses: RAID 1 is ideal for small databases or any other application that
requires fault tolerance and minimal capacity.
- Benefits: Provides 100% data redundancy. Should one drive fail, the
controller switches to the other drive.
- Drawbacks: Requires 2 drives for the storage space of one drive.
Performance is impaired during drive rebuilds.
- Fault Tolerance: Yes.
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