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LibraryMaster™ - Single Tape Library
Ultera's LibraryMaster™ controller solution is designed for single tape library applications featuring Data Striping (RAID Levels 0 and 3), Data Mirroring (RAID Level 1) and Stripe/Mirror (RAID Level 10) to protect your data at a fault tolerance level you choose.  
    Single tape library striping or mirroring
    Library striping for high speed backup/restore 
    Library mirroring for disaster recovery applications 
    Combines RAID and automation with seamless scalability
    Operation continues in the event of a single drive or media failure
5 Channel
High Performance,
Data Striping and Mirroring
Ultera's LibraryMaster™ controller features Data Striping and appears to the host system as a single tape library with one or more tape drives ("Logical Drive Sets").   A "Logical Drive Set" consists of an array of up to 5 tape drives and is seen by the host as a single logical tape device ("Virtual Tape Drive").  The LibraryMaster™ controller also features Data Mirroring and supports creating up to 5 "EXACT" original tape copies simultaneously.  Productivity is increased tremendously for applications that require duplicating original master tapes. 
Dual Channel
Low Cost Data Mirroring
Ultera's dual channel LibraryMaster™ Mirroring controller supports creating 2 "EXACT" original tape copies simultaneously.  Productivity is increased for applications that require duplicating original master tapes. 
All Major Tape Drives and
Tape Library
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The operating mode "Striping 2, 2+1, 4, 4+1", "Mirroring 2, 3, 4, 5" or "Stripe/Mirror 2+2" of the LibraryMaster™ controller determines the number of tape drives and/or physical tape cartridges required per "logical" tape set.

If a single tape library has 5 tape drives and 100 tape slots and the operating mode of the LibraryMaster™ controller is set to Striping 4+1, the LibraryMaster™ controller appears to the backup server as a single tape library with 1 tape drive and 20 tape slots transparently.

Each "logical" tape set (i.e. 1, 2, 3..20) corresponds to 5 consecutive tape slots in the library.  When an application on the backup server moves a "logical" tape, the LibraryMaster™ controller transparently initiates multiple move commands to move the entire "logical" tape set to/from the selected tape drive set.

If the same tape library has 5 more tape drives added, another LibraryMaster™ controller can be added to operate the new Striping 4+1 drive set transparently as a single "logical" tape drive.  The backup server in this case will see a single tape library with 2 tape drives and 20 tape slots.
 How Does Ultera's LibraryMaster™ Controller Work?   
Ultera's Library Tape RAID solutions are designed to be plug and play compatible with all operating systems and hardware platforms.  Ultera's LibraryMaster™ controller adds value to your tape library investment by providing data protection and fault tolerance at a level that no single tape library can provide.  A description of how the LibraryMaster™ controller transparently applies Tape RAID enhancements to a conventional tape library is detailed below.
The operating mode of the LibraryMaster™ controller determines the size of a "Logical Drive Set" (2, 3, 4 or 5 tape drives).  This controls how the LibraryMaster™ controller presents the attached library's geometry and element addressing to the host computer system.
The size of a logical tape volume set is equal to the "Logical Drive Set" size as shown below:
Operating Mode Logical Tape Volume Size Logical Drive Set Size
Striping 2+0 2 Tapes 2 Drives
Striping 2+1 3 Tapes 3 Drives
Striping 4+0 4 Tapes 4 Drives
Striping 4+1 5 Tapes 5 Drives
Mirroring 2 2 Tapes 2 Drives
Mirroring 3 3 Tapes 3 Drives
Mirroring 4 4 Tapes 4 Drives
Mirroring 5 5 Tapes 5 Drives
The LibraryMaster™ controller automatically adjusts how the host backup management software sees the library's inventory, number of drives and number of import/export slots based on the following:
Number of Media Slots  Equals the total number available divided by 
the "Logical Drive Set" size.
Number of Optical Drives
Number of Import/Export Slots
The LibraryMaster™ controller presents each logical tape volume set to the host computer as a single media cartridge and transparently loads and unloads a complete physical set of tape media cartridges for each logical mount/dismount request from the backup management software.
Starting with the lowest slot number in the library, a logical tape volume set occupies up to 5 consecutive slots.  For example, a LibraryMaster™ controller can be set to a Striping 4+1 or Mirroring 5 operating mode with a logical drive set size equal to 5.  This means 5 consecutive slots represent a single logical tape volume and 5 consecutive tape drives within the tape library (starting with the lowest drive element address) represent a single logical drive set.
The host software views each logical drive set in the tape library as a single tape drive via the LibraryMaster™ controller.  The primary LibraryMaster™ controller attaches to the robot and the lowest drive element address in the tape library and then to consecutive drive elements based on the size of the logical drive set.  Additional LibraryMaster™ controllers may be added to operate the next set of available drives.
The host software views the import/export door as one or more library elements. If the physical number of import/export door slots equals the size of the logical tape set, the LibraryMaster™ controller presents these door slots as a single logical import/export slot and moves an entire logical tape set to the door or from the door as one logical move operation. 

If the physical number of import/export door slots equals one,  the LibraryMaster™ controller presents this door slot as a single logical import/export slot and moves an entire logical tape set to the door or from the door sequentially, one at a time. 

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