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Disk Array

A disk array contains multiple disk drives, and has cache memory and advanced functions, such such as RAID and virtualization, designed to protect data integrity. A disk array contains the following components:

Controllers
Cache memory
Enclosures
Power Supplies

Disk arrays improve their availability and maintainability with redundant instances of each component, including fans, often to the point where they remove all single points of failure. The components are hot swappable for additional durability and uninterrupted function.

Three engineers at UC Berkeley first defined RAID in 1987 as a Redundant Array of Inexpensive Disks. RAID uses cheaper personal computer disk drives, arranged in arrays, for redundancy. Marketing executives changed the term to Redundant Array of Independent Disks because inexpensive has negative connotations such as poorly made or unreliable.

People refer to any disk array as RAID, meaning storage configurations that mirror data across multiple hard drives. All RAID designs share two common goals:

Make data more reliable
Increase I/O speed

A RAID array is any configuration of disks set up via RAID technology. Even though the RAID distributes data amongst the drive group, the computer user and operating system see only one disk drive. RAID achieves redundancy in two ways:

Mirroring data on multiple drives
Storing extra parity data, so one disk's failure doesn't destroy the data. When a drive fails, or many drives fail, the system reconstructs the data using the remaining data (on operating drives) and the parity data.

The storage capacity of an array is less than the combined storage capacity of the drives in the array. For example, a Raid 1 array with two drives stores only the capacity of one drive, and a Raid 5 array with many drives loses one full drive worth of storage. Some arrays offer faster read and write capability than any single drive in the array. Different RAID arrays offer different combinations of data protection, storage size, and speed. RAID 0, 1, and 5 are the most common arrays.

RAID 0 (striped) gives better speed with 100% storage capacity of the combined drives in the array. But if any one drive fails, the array loses that data.
RAID 1 (mirrored) duplicates data on every drive in the array. RAID 1 provides 100% redundancy, but the capacity of only the smallest drive in the array. Each drive contains a copy of the data on every other drive, at any moment in time.
RAID 5 (striped with parity) combines a group of three or more drives so that data remains if any one drive fails. Storage is equal to the total storage from all drives in the array, minus one drive's storage capacity.
RAID 6 (striped with dual parity) is RAID 5 that can recover data even if two drives fail.
RAID 10 (1=0) employs both striping and mirroring. RAID 1+0 mirrors first, then stripes, while RAID 0+1 stripes first, then mirrors. The explanation is complex, but RAID 1+0 withstands failures better than RAID 0+1.

World Data Products offers a wide range of disk array storage configurations. Visit http://wdpi.com/used-storage.html for details.