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6.1 How RAID Works
RAID, or Redundant Array of Independent Disks, is a data-storage technology that
spreads data across multiple drives. This technology provides several benefits:
:
Data redundancy for protection and availability.
Higher performance as a result of reading or writing on several drives
simultaneously.
Scalability for expansion of storage.
Accusys RAID systems use a hardware controller to manage multiple drives as one or
more RAID array group, which offloads RAID task from host, and provides
independent, fast and highly efficient storage.
The way of controller stores and retrieves data on the RAID system is determined by
the RAID level and storage method you choose. Once you have defined a group of
drives as an array group, each logical disk appears to the host system as one Logical
Unit (LUN), regardless of the number of actual drives in that logical unit.
6.2 RAID Levels
The RAID system supports several RAID levels and configurations. Each level has a
different architecture and provides varying degrees of performance and fault tolerance.
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