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Ultera RAILStor™ - Multiple Optical Libraries
Ultera's RAILStor™ controller solution is designed for multiple optical library configurations featuring Data Striping (RAID Levels 0 and 3).  Increase performance and provide fault tolerance with multiple library striping.
    Optical Jukebox Striping
    Ideal for Video on Demand
    Increases performance by striping up to 5 libraries
    Combines RAID and automation with seamless scalability
    Read and recording speeds are increased by as much as 4 times
5 Channel
High Performance,
Data Striping
Ultera's RAILStorô controller features Data Striping and appears to the host system as a single optical library with one or more optical drives ("Logical Drive Sets").   A "Logical Drive Set" consists of an array of up to 5 optical drives and is seen by the host as a single logical optical device ("Virtual Optical Drive").  
Magneto Optical, 
MO Devices
Ideal for Video On Demand Applications!
 How Does Ultera's RAILStor™ Controller Work?   
Ultera's Library Optical RAID solutions are designed to be plug and play compatible with all operating systems and hardware platforms.  Ultera's RAILStor™ controller adds value to your optical library investment by providing data protection and fault tolerance at a level that no single optical library can provide.  A description of how the RAILStor™ controller transparently applies Optical RAID enhancements to conventional optical libraries is detailed below.
The operating mode of the RAILStor™ controller determines the size of a "Logical Drive Set" (2, 3, 4 or 5 optical drives).  This controls how many optical libraries can be attached to the RAILStor™ controller.
The size of a logical optical volume set is equal to the "Logical Drive Set" size as shown below:
Operating Mode Logical Optical Volume Size Logical Drive Set Size
Striping 2+0 2 Optical Media 2 Libraries
Striping 2+1 3 Optical Media 3 Libraries
Striping 4+0 4 Optical Media 4 Libraries
Striping 4+1 5 Optical Media 5 Libraries
Mirroring 2 2 Optical Media 2 Libraries
Mirroring 3 3 Optical Media 3 Libraries
Mirroring 4 4 Optical Media 4 Libraries
Mirroring 5 5 Optical Media 5 Libraries
The RAILStor™ controller presents to the host backup management software the same inventory, number of drives and number of import/export slots as if it was a single optical library.
The RAILStor™ controller presents each logical optical volume set to the host computer as a single media cartridge and transparently loads and unloads a complete physical set of optical media cartridges for each logical mount/dismount request from the backup management software. 
Starting with the lowest slot number, a logical optical volume set occupies the same slot number in each library.  For example, five independent optical libraries can be attached to a RAILStor™ controller with a logical drive set size equal to 5.  This would mean the RAILStor™ controller is set to a Striping 4+1 or Mirroring 5 operating mode and data is either striped or mirrored across the optical libraries to the appropriate drive set. 
The host software views each logical drive set as a single optical drive via the RAILStor™ controller.  The array channels of the primary RAILStor™ controller attach to a robot and the lowest drive element address in each optical library.  Additional RAILStor™ controllers may be added to operate the next set of available drives(1 per optical library).
The RAILStor™ controller presents the same number of door slots that exist in a single optical library.  When a logical optical volume set is imported/exported, the RAILStor™ controller moves an entire logical optical set in parallel to the door or from the door as one logical move operation. 
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