Problem with Tape Library paths

Hi everyone,

I've got a problem with my exchange duplication to tape, it's failing with status 150

Here the detailed status:

20.04.2015 14:51:09 - awaiting resource CopyTo_MA_Scalar_i500 - No drives are available
20.04.2015 14:52:32 - awaiting resource CopyTo_MA_Scalar_i500 Reason: Drives are in use, Media Server: SERVER, 
                 Robot Number: 0, Robot Type: TLD, Media ID: N/A, Drive Name: N/A, 
                 Volume Pool: Tape_Out, Storage Unit: CopyTo_MA_Scalar_i500, Drive Scan Host: N/A

After that I ran the command vmoprcmd:

Drive Name               Label   Ready  RecMID  ExtMID  Wr.Enbl.  Type
    Host                       DrivePath                            Status
=============================================================================
HP.ULTRIUM5-SCSI.000     No      No                     No        hcart2
    r3demastmbk02.r3.group.corp  {1,0,3,1}                            TLD
    r3demastmbk02.r3.group.corp  /dev/alias/nst/VD001AV1408BVT00045 ( TLD
    r3demuadfbk02.r3.group.corp  /dev/alias/nst/VD001AV1408BVT00045 ( SCAN-TLD

HP.ULTRIUM5-SCSI.001     No      No                     No        hcart2
    r3demastmbk02.r3.group.corp  {1,0,3,2}                            TLD
    r3demastmbk02.r3.group.corp  /dev/alias/nst/VD002AV1408BVT00045 ( TLD
    r3demuadfbk02.r3.group.corp  /dev/alias/nst/VD002AV1408BVT00045 ( SCAN-TLD

HP.ULTRIUM6-SCSI.000     Yes     Yes    000024  000024  Yes       hcart3
    r3demastmbk02.r3.group.corp  {1,0,5,0}                           TLD
    r3demastmbk02.r3.group.corp  /dev/alias/nst/F3A1C35000 (r3demastm ACTIVE
    r3demuadfbk02.r3.group.corp  {1,0,4,0}                           SCAN-TLD
    r3demuadfbk02.r3.group.corp  /dev/alias/nst/F3A1C35000 (r3demastm TLD

HP.ULTRIUM6-SCSI.001     No      No                     No        hcart3
    r3demastmbk02.r3.group.corp  {2,0,4,0}                           ACTIVE
    r3demastmbk02.r3.group.corp  /dev/alias/nst/F3A1C35004 (r3demastm DOWN-TLD
    r3demuadfbk02.r3.group.corp  {2,0,4,0}                            SCAN-TLD
    r3demuadfbk02.r3.group.corp  /dev/alias/nst/F3A1C35004 (r3demastm TLD

Duplication is running fine via Drive "HP.ULTRIUM6-SCSI.000" but via HP.ULTRIUM6-SCSI.001 it's failing.

In my opinion thats an issue with the two different paths.

In windows device manager everything looks fine.

When i run "scan -tape" the result is clean.

Rebooting the media server and tape libary didn't solve the problem.

Do you have any idea how to fix this? 

Thanks in advance!

Best regards