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What is RAID, RAIT, RAIL?
Ultera Systems, Inc. is the leading manufacturer of RAID (Redundant Array of Independent Drives) , RAIT(Redundant Array of Independent Tape Drives) and RAIL(Redundant Array of Independent Libraries) hardware controller solutions designed for removable media data storage devices:
dot.gif (333 bytes) Tape Drives, Autoloaders, Libraries
dot.gif (333 bytes) Optical Drives, Autoloaders, Libraries
Ultera's fourth generation proprietary hardware RAID ASIC design applies RAID Levels 0, 1, 3 and 10 to enhance performance, capacity and data protection to a level that no single removable media data storage device can provide.  See the advantages of these RAID Levels below.
RAID LEVELS
Six different RAID Levels are defined by the University of California, Berkeley to describe various levels of disk array architectures.  Although they are numbered from Level 0 to Level 5, successive numbers do not indicate higher fault tolerance or higher performance, only different capabilities.
OPTICAL SOLUTIONS TAPE SOLUTIONS
Disk RAID Level 0

Striping
Data is "Striped" across multiple disks with no additional ECC codes or redundancy.
Tape RAID Level 0

Striping
Provides high performance and capacity for tape applications.  Up to 4 times faster than a single tape drive!
Disk RAID Level 1

Mirroring with Fault Tolerance
All data is redundantly recorded,
"Mirrored" to multiple disk drives.
Tape RAID Level 1

Mirroring with Fault Tolerance
Provides the ability to create multiple tape backup copies in the same time it takes to create a single tape!
Disk RAID Level 3

Striping with Parity Protection
Data is Striped byte-by-byte dividing the host block transfer size across multiple disks, and a single additional disk is dedicated to recording parity data.
Tape RAID Level 3

Striping with Parity Protection
Provides high performance and capacity for tape applications including data protection using a parity tape volume for long term data archiving!
Disk RAID Level 10

Mirroring and Striping
(Combination of RAID Levels 1 & 0)
Data is Striped byte-by-byte dividing the host block transfer size across multiple disks, and at the same time a Mirrored set of identical disks are created simultaneously.
Tape RAID Level 10

Mirrored Striping
Provides high performance and capacity for tape applications.  Up to 2 times faster than a single tape drive plus a duplicate set of media cartridges are produced for offsite storage.
The following RAID Levels are defined by the Berkeley standard but, they do not directly apply or they have design limits when applied to removable media data storage devices in handling variable block sizes and achieving the highest performance and maximum device parallelism as described above.
Disk RAID Level 2

Data is Striped across multiple disks, and error checking and correcting (ECC) codes are written onto additional disks for use in fault-recovery.
Disk RAID Level 4

Data is Striped block-by-block across multiple disks, and a single additional disk is dedicated to recording parity data.
Disk RAID Level 5

Data is Striped block-by-block across multiple disks, and parity data is also spread out over multiple disks.
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