Tape Library detecting twice. RRS feed

  • Question

  • So I am starting working again on DPM, after 3-4 years :) The same infrastructure (expanded one)

    Here's the info of setup of our one DPM server (Out of many DPM servers) where I am facing issue. 

    - SCDPM 2012 R2

    - Windows Server 2012 R2, Standard.

    - HP MSL 2024 G3 Series Library. - Fiber Channel with multipathing.

    I noticed below error is coming when I run rescan or tape inventory. 

    Though it's detected in DPM console (tapes and drive information is also visible in console), but error is about connection so I checked in device manager, strangely its showing two libraries and two media changer devices (We have installed only one library) 

    Looking for more information within our ticketing tool (internal) I found same issue happened before as well where Microsoft fixed it by deleting some info from database. Based On that information.... I dig up in SQL DB table dbo.tbl_MM_library, it showing multiple entries for same device where IsOffline value is FALSE for third device and TRUE for all others. 

    If I compare this table information with our another DPM server (Which has same setup including library) There are only two entries, one for Library and one for drive. I am bit confused to start troubleshooting, any one face this issue ! Could it be OS issue ? DPM issue or Library issue or Multipathing ! Any help would be much appreciated. 

    • Edited by V Jay Rana Friday, January 18, 2019 2:07 PM
    Friday, January 18, 2019 1:51 PM


  • Update -

    Ok, so got technical guide for this specific tape library from HP site, found that multipathing over this library is licensed feature and we don't have any license key purchased. We have connected both Fiber ports, need to drop one of them. 

    I will share update once I fix this. 

    • Proposed as answer by Leon Laude Friday, February 15, 2019 9:10 AM
    • Marked as answer by V Jay Rana Friday, February 15, 2019 4:23 PM
    Thursday, January 24, 2019 11:23 AM

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