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1. How many devices can be supported?
   A: 4096 virtual tape device paths are supported derived from: Up to 256 devices per control unit Up to 16 control units per port Up to 256 lpar-cu paths per port (logical paths) Up t...
2. Do Luminex mainframe virtual tape solutions support IBM zOS v2?
   Yes! Luminex mainframe virtual tape solutions support any operating system with 3490/3590 device support.
3. How does the Channel Gateway eject tapes?
   ... A: For disk based storage, an eject (rewind/unload) is simply the process of making the virtual tape data no longer available. For true tape-based storage, an eject command is issued to the drive...
4. Can a mainframe be IPL’d from a Channel Gateway?
   A: Yes. There is no difference between a 3490 tape drive and the Channel Gateway. The IPL tape must be logically mounted either through a command line interface on the server or through the Lu...
5. How much data can be written to a virtual tape?
   A: The theoretical limit is near 256 GBytes and is dependent on block size. Confirmation of existing customer OS levels, application levels, etc. needs to be determined to verify if the host and appl...
6. How many blocks can be written to a tape?
   A: 4 million.
7. What is the storage capacity overhead introduced by the Channel Gateway?
   ... usually in the range of .05% to .10% of the total storage capacity. The overhead is 8 bytes per tape block. Thus if you write a 10 Gbyte tape using a block size of 16K, the overhead is .05% and...
8. Does the Channel Gateway support multiple datasets on a single virtual tape?
   A: Yes.
9. How is end-of-tape handling performed?
   A: A virtual tape can reach end-of-tape under the following conditions: The storage capacity has reached a minimum configured value; the maximum configured amount of data has been written to ...
10. Where is the metadata for the tapes stored? Is there a database?
    A: All metadata is stored with the tape data. A database is not required for any Luminex Mainframe Virtual Tape solution, but may be required for non-Luminex virtual tape libraries and physical tape l...
11. Can multiple Channel Gateways access the same data?
    ...software may be required to allow all Channel Gateway servers to access and share the same virtual tape data.
12. How much data is pre-allocated for each virtual tape?
    A: No storage is reserved for a virtual tape. Unlike true tape, there is no wasted space on the storage device.
13. Can other applications access the Channel Gateway data?
    A: Yes, by configuring the Channel Gateway to unblock and translate the data, the virtual tape data will be available to other applications that have physical access to the storage device. The...
14. How are Private and Scratch mounts requests resolved on the Channel Gateway?
    ...accomplished under VSE). The Channel Gateway uses the Load Display command information to make the tape data available to the mainframe. If the request is for a scratch tape, the Channel Gateway wil...
15. Do tapes need to be initialized (using IEHINIT) before use?
    A: No. The Channel Gateway will automatically provide the VOLSER label information for any tape that has not previously been mounted.
16. How are Scratch pool requests managed?
    A: JCL is provided/written to periodically send to the Channel Gateway a report on the tapes that are to be placed back into the scratch pool. The report is sent to a special VOLSER on the Chan...
17. How does the Channel Gateway determine which storage pool to use when a scratch tape is mounted?
    A: The Channel Gateway can easily be configured regarding which storage pool / filesystems to use. The selection mechanism is script based and easily modified by Luminex engineers. The two defa...
18. How does the Channel Gateway work in VSE environments?
    ...e Channel Gateway. VSE's Automatic Volume Recognition (AVR) will then recognize the newly mounted tape.
19. In the absence of a tape management system, how does CGX emulate common handling tasks associated with physical media?
    The CGX Admin GUI provides the ability to: select a volume and mount it on any available device view a volume's current header label info and metadata such as size and compression rate add n...
20. In the absence of a tape management system, how does CGX emulate common handling tasks associated with physical media?
    The CGX Admin GUI provides the ability to: select a volume and mount it on any available device view a volume's current header label info and metadata such as size and compression rate add n...