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Tutorial that explains how configure “Quantum SuperLoader 3 – LTO 4” in an “ESX 3.5” and attach it to “Virtual Machine”. 
How to do when the "SCSI ID" of "Library" is the same as "Tape Drive", the answer are bellow......

 

1. Configure “SuperLoader” to use a “SCSI ID”, in this procedure I have used a “SCSI ID 10” for “Medium Changer” and “11” for “Tape drive”.
2. Shutdown “ESX Server”.
3. Connect “Quantum SuperLoader 3” on the SCSI card of (host) ESX server.
4. Boot “ESX Server” and go to “SCSI Configuration Tool” of your “SCSI Card”, in this sample, I use an “Adaptec SCSI Card” I press the key “CTRL+A” at boot to enter in the configuration mode.
5. Enable “MULTI LUN” option.
   1. Go to “SCSI configuration” of connected devices.
   2. Enable the option “MULTI LUN” for “SCSI ID 10”.
   3. Reboot.
6. Connect “ESX Server” with “ssh tool” like “putty”.
   1. In ssh command line, type the command :
      cat /proc/scsi/scsi
   2. Find the library and tape drive in the list
      
      
      
   3. 
      
   4. Note “scsi, channel, id, lun” for “Medium changer” and “tape drive”.
      Tape               : scsi2, Channel 00, Id 10, Lun 00
      Loader           : scsi2, Channel 00, Id 10, Lun 01
   5. Run command to list storage infos :
      esxcfg-info -s | more
   6. Find in list the “vmhba name” of “tape” and “loader”.
      
      
      
      
      
   7. Note “vmhba name” for “Medium changer” and “tape drive”.
      Tape               : vmhba2:10:00
      Loader           : vmhba2:10:01
      
      
      
   8. Remove the “Virtual Machine” from inventory of ESX.
   9. Edit the “[server].vmx” file of “Virtual Machine” and add the following lines: (change “SCSI ID” to your configuration).
      Note: Add a new “SCSI ID” for “Tape drive” check before that is free in your ESX server.
      
      scsi:10.present = "TRUE"
      scsi:10.deviceType = "scsi-passthru"
      scsi:10.name = "vmhba2:10:1:0"
      
      scsi:11.present = "TRUE"
      scsi:11.deviceType = "scsi-passthru"
      scsi:11.name = "vmhba2:10:0:0"
   10. Save the “[server].vmx” file.
   11. Add the “Virtual Machine” in inventory of ESX.
7. Check if the “Virtual Machine” uses the “SCSI ports” that you have set.
8. Choose the “SCSI Device” type in list for “Autoloader” and “Tape drive”.

1. Boot the “Virtual Machine”.
2. If the configuration works, you will see an “Unknown Medium Changer” in “Windows Device Manager”.
   
   
   
3. Install “Windows Device Driver for Quantum Superloader 3” “qtm-SuperLoader3-v2_5_1_0” downloadable on “Quantum” web site.
   
4. After installation, you will see the “Medium Changer” as “Quantum SuperLoader”.
   
   
   
5. That’s all.

References :

VMWare Configuring tape drives and media changers on ESX 3.0.x hosts