[90:1004] Device address not found.

[Normal] From: BSM@cellsrv01.in.com "Backup_Spec_Win1"  Time: 4/16/2014 12:08:46 PM

 Backup session 2014/04/16-256 started.

[Normal] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:08:55 PM

 STARTING Media Agent "AUT01_D01"

[Normal] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:09:01 PM

 By: UMA@winsrv01.in.com@Changer0:7:0:1

 Loading medium from slot 8 to device Tape1:7:0:0C

[Warning] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:09:57 PM

 The device "AUT01_D01" could not be opened("Device could not be accessed")

[Normal] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:09:57 PM

 Starting the device path discovery process.

[Critical] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:10:00 PM

[90:1004]  Device address not found.

[Normal] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:10:00 PM

 Device path discovery process finished.

[Normal] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:10:00 PM

 By: UMA@winsrv01.in.com@Changer0:7:0:1

 Unloading medium to slot 8 from device Tape1:7:0:0C

[Normal] From: BMA@winsrv01.in.com "AUT01_D01"  Time: 4/16/2014 12:10:39 PM

 ABORTED Media Agent "AUT01_D01"

[Normal] From: BSM@cellsrv01.in.com "Backup_Spec_Win1"  Time: 4/16/2014 12:10:39 PM

 Backup Statistics:

         

  Session Queuing Time (hours)         0.00      

  -------------------------------------------    

  Completed Disk Agents ........          0        

  Failed Disk Agents ...........          4        

  Aborted Disk Agents ..........          0        

  -------------------------------------------    

  Disk Agents Total  ...........          4        

  ===========================================    

  Completed Media Agents .......          0        

  Failed Media Agents ..........          1        

  Aborted Media Agents .........          0        

  -------------------------------------------    

  Media Agents Total  ..........          1        

  ===========================================    

  Mbytes Total .................       0 MB      

  Used Media Total .............          0        

  Disk Agent Errors Total ......          0  

Troubleshooting steps as follows:

>> Logged into the media server and checked for devices claimed in Device Manager. Found the devices.

>> Ran devbra -dev to determine the SCSI address.

>> Found N/A for drive

C:\>devbra -dev

Exch    HP:1x8 G2 AUTOLDR  Path: "Changer0:0:0:1"  SN: "AABBCCDD1E"

        Description: CLAIMED:HP StorageWorks 1x8 Cartridge Autoloader

        Revision: 4.20  Flags: 0x0016  Slots: 8  Drives: 1

        Drive(s) SN:

                "ABCDEFGHIJ"

Tape    HP:Ultrium 3-SCSI  Path: "Tape0:0:0:0"  SN: "N/A"

        Description: CLAIMED:HP LTO3 Drive

        Revision: Q51W  Device type: lto [13]  Flags: 0x0011

>> Checked if the drive is locked by DP

[root@cellsrv01:/root]

# omnimm -show_locked_devs | grep AUT01_D01

[root@ cellsrv01:/root]

>> Stopped DP Inet from Services.msc and Ran LTT.

>> Got error message that "mma.exe" process is accessing the device. Killed the mma.exe process from the Task Manager.

>> rescanned the devices in LTT. Able to detect both autoloader and it's drive this time.

>> Ran devbra -dev, which got the SCSI address.

C:\>devbra -dev

Exch    HP:1x8 G2 AUTOLDR  Path: "Changer0:7:0:1"  SN: "AABBCCDD1E "

        Description: CLAIMED:HP StorageWorks 1x8 Cartridge Autoloader

        Revision: 4.20  Flags: 0x0016  Slots: 8  Drives: 1

        Drive(s) SN:

                "ABCDEFGHIJ "

Tape    HP:Ultrium 3-SCSI  Path: "Tape1:7:0:0C"  SN: "ABCDEFGHIJ "

        Description: CLAIMED:HP LTO3 Drive

        Revision: Q51W  Device type: lto [13]  Flags: 0x0011

>> Ran the backup successfully.

Cause :

The DP media agent was accessing the drive and didn't let any other process to send commands. After the hung process is killed, the drive was accessible for normal operations.