Tape Drive Serial # madness

Last post 11-11-2010, 7:31 AM by mort. 5 replies.
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  • Tape Drive Serial # madness
    Posted: 11-09-2010, 2:32 PM

    I have 4 IBM 3592 E05 drives that I've been using with my commvault system for 3 years now.  They're fiber attached to the SAN switched and zoned (in pairs) to my media agents who share them.

    Now, I have 2 drives that are acting up on me.  One drive says

    While accessing a drive the Serial Number obtained [000007874174] is different from expected Serial Number [0000078F3334].

    The F3334 is the actual Ser# on the drive, and 74174 is from another drive I have (which still works).

    The way my drives look now is (and this matches their physical layout in the tape library).

    Drive 1 - 78F3334  - Unusable due to error I posted above

    Drive 2 - 7874513 - Fully Accessible

    Drive 3 - 7874173 - Unusable due to error listed as " SCSI-2 Reservation Command to the Drive failed"

    Drive 4 - 7874174 - Fully Accessible

    I've tried rebooting my media agents.  Is this an issue with IBM?  Possibly a zoning change on the SAN?

  • Re: Tape Drive Serial # madness
    Posted: 11-09-2010, 2:52 PM

    Good afternoon,

    For that serial number issue, you would want to redetect the library via the Library & Drive config in control panel.   This can happen any time the OS is rebooted and there has been any change to the drivers or firmware etc. It can happen for no real reason if for some reason the OS redetects the device.



  • Re: Tape Drive Serial # madness
    Posted: 11-09-2010, 2:57 PM

    This seemed to help drive #1 indirectly (it detected 3 more controllers), but the drive info stayed the same.


    Drive 3 is still messed up.  May need to get IBM in on that one.

  • Re: Tape Drive Serial # madness
    Posted: 11-09-2010, 3:05 PM



    Thanks for the update.  I would recommend engaging IBM on that issue with Drive 3.



  • Re: Tape Drive Serial # madness
    Posted: 11-10-2010, 11:28 AM

    Are you using disk also?  The issue tends to be the drive mapping is "out of whack"(technical term) if you reboot your media agents they should be discovered in order. In our case the solution was to zone the disk targets ahead of the tape devices. If you decide to just follow the reboot of the Media agent method you have to reboot all the media agents (because you stated that they all share the drives).

  • Re: Tape Drive Serial # madness
    Posted: 11-11-2010, 7:31 AM
    • mort is not online. Last active: 01-13-2016, 10:37 AM mort
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    There is also a registry key fix to the IBM drivers to stop tape drives changing names across reboots on Windows servers.  Which I have seen cause the serial number changed reports in commvault.

       Version and later versions of the device driver have an
       option for enforcing file names for tape drives that will persist
       across reboots of the operating system.  For example, if your tape
       drive has the name \\.\tape3 and the persistent naming option is
       used, then \\.\tape3 will be reserved for use by that device after
       an operating system reboot. To take advantage of this feature, place
       a DWORD value in the registry called PersistentNaming and assign it
       a value 1 at:

       and reboot your system.

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