Commvault work Drive LTO8 with media LTO7 Type M8

Last post 03-06-2020, 6:32 AM by Amarylis. 4 replies.
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  • Commvault work Drive LTO8 with media LTO7 Type M8
    Posted: 03-03-2020, 8:14 AM
    We have an Overland tape (Neo XL-80) with 4 LTO8 Drives (IBM ULTRIUM-HH8), and we are having trouble using LTO7 tapes initialized with barcode M8 (8.79TB capacity). The documentation and help do not help, and we are losing the capacity of the tapes, with the tests of the support of commvault. Could someone help us?
    (commvault v11 sp18.9)
    Thank you in advance! 
    Henry Lopes
  • Re: Commvault work Drive LTO8 with media LTO7 Type M8
    Posted: 03-03-2020, 2:01 PM


    HPE LTO-7 cartridge initialized as Type M media

    A technical overview of the main characteristics of LTO-7 Type M media




    LTO Type M cartridge (M8)

    There's specific steps needed for it to work correctly.


    "If an un-initialized M8 cartridge is not initialized in a tape library that supports un-initialized M8 cartridges, then the cartridge may inadvertently and silently be initialized at the L7 density (i.e., at a 6 TB native capacity) even if the barcode label states M8. This could occur with the usage of non-TS4500 tape libraries, stand-alone LTO 7 tape drives, stand-alone LTO 8 tape drives, down-level LTO 8 tape drive firmware, down-level TS4500 tape library firmware, or down-level ISV software that does not recognize that M8 cartridges should only be mounted in LTO 8 tape drives. M8 cartridges that are inadvertently initialized at the L7 density can continue to be read and written in LTO 7 and LTO 8 tape drives; however, they will remain limited to the 6 TB native capacity."






  • Re: Commvault work Drive LTO8 with media LTO7 Type M8
    Posted: 03-04-2020, 6:21 AM
    The problem is not with the drive and tapes. but in the commvault that after manual settings, made by the support of commmvault itself, he even recognizes the tape with the capacity of 8.79TB, but finishes the recording in 5.9TB.

    We got only 1 tape that he recorded above 7TB, but after a few days and a patch on the commserver, he stopped recording on the new tapes.

    Does anyone on the forum use these Type M8 tapes? If so, are you recording normally, or did you have to make any changes to record?

    Thanks in advance
  • Re: Commvault work Drive LTO8 with media LTO7 Type M8
    Posted: 03-05-2020, 9:04 AM

    We have several M8 tapes and I believe the only thing special one needs to do is make sure the M8 barcode is on the tape when it first gets put into the drive.

    Attachment: LTO-M8-tapes.png
  • Re: Commvault work Drive LTO8 with media LTO7 Type M8
    Posted: 03-06-2020, 6:32 AM


    we have M8 media in TS4500 IBM library and LTO8 drives. Work as expected.

    I only had to select media type during media discovery process as ULTRIUM V8M.

    Media have about 8,3 TB capacity (when writing compressed data) and media type "ULTRIUM V8M"

    Please note that once the blank tape has been written as "LTO7" (6TB) capacity there is no way to reinitialize it to 8M (and vice-versa).

    Given that fact and some requirements regarding drive and library firmware I tested the proces on single tape - including real capacity measurement.



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