Question about Quantum PX506 LTO-3 Tape Drive

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Netbackup not recognizing library robot in windows

Windows 2003 with Netbackup 6.5.Quantum PX506 library.
OS sees unknown medium changer ( with Microsoft driver), but Netbackup does not see it when configuring storage devices. It just sees the 2 LTO3 tape drives (symantec drivers are loaded on drives)

I can not find any driver specifically for the medium changer either from Quantum or Symantec. Quantum states to use drivers from backup software but just have tape drive drivers , not medium changer.

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SOURCE: medium changer did not show

Check that the unit is set to random mode instead of sequential mode

(FYI Sequential mode treats the whole machine as a single big tape, while random lets the software say what tape is going to be used.)

Posted on Nov 05, 2008


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How to allocate media with ntbackup

  1. Valueloader should have "SEQ" on front screen.
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NTBackup will NOT see individual tapes, but treat the SDLT320 drive as a stand alone with one big tape, and the Valueloader will automatically change tape, in sequence, until the backup is done.

This is the major difference between a "Autoloader" (Sequential Mode) and a "Library" (Random Mode).

In Sequential Mode the robot (or Medium Changer) is hidden from the OS, thus only providing a tape drive. The autoloader is smart enough to see incoming data and will move Tape1 into the drive. As the media fills, the autoloader will swap media on it's own. By the time the backup is complete, whether it be one or all 8 pieces of media, Windows has no clue that it's data crossed multiple pieces of media.

In Random mode, the library is dumb and will do nothing on its own. It's told by software (i.e. Backup Exec, CommVault, etc.) when to move a tape into the drive and which tape to move!

The advantage of using Random Mode is that software runs the show and media is effeciently managed. Restores are much quicker as the exact tape a file is recorded on can be directly loaded and extracted, vs. (worst case in Seq. mode) having to go through each tape, in sequence, before getting to the file that could be on that last tape (think hours!).

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Sun L25 Tape Library

what drives are inside as these units can come in several configs. For all SCSI units the Adaptec 29320 is good for fiber the qlogic cards are my prefered cards.

Drivers are available from sun for the library and drives although you can sometimes use the standard windows drivers for many drives. (search for LTO as the tape drive manufacturer in win drivers for LTO) Although best to use sun drivers if at all possible.

Library comes up as a medium changer in device manager.

What backup software are you using? If Backup exec then the latest version already comes with their drivers built in

hope this helps

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First off, I have to say that I have had nightmares with Quantum tape libraries. It is possible that they are still manufacturing lemons. I had one replaced 4-times and it still did not work!

Start troubleshooting by making sure that it is identified by the controller card it is connected to. You should see this during the server POST before Windows starts. If you don't see it there then Windows definitely won't see it. Send it to Quantum for service.

If the controller sees it then make sure that you are using the Backup Exec drivers. Never use the manufacturer's drivers with Backup Exec. Veritas, now Symantec, has a downloadable utility called the Device Driver Installation Wizard that will make sure you have the correct driver loaded.

I hope this helps.

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Medium changer did not show

Check that the unit is set to random mode instead of sequential mode

(FYI Sequential mode treats the whole machine as a single big tape, while random lets the software say what tape is going to be used.)

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That thing required a SCSI terminator pack doesn't it.

If so, is it working properly.

I've had those things go out on me before leaving me to pull my hair out many times.

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Please check your firmware on the tape drive. Update with X-Talk software that can be downloaded from

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When Windows (XP?) was installed in the Quantum Fireball LCT1520 of the old Compaq Presario, the OS was married to the hardware specifically the motherboard/chipset. When it was removed and transplanted to the newer PC, the OS would be looking for the old hardware settings/configuration and since the new PC has a different motherboard and therefore cannot find the old hardware, it would loop/reboot continuously and/or BSODs.

One method of getting the old HD to work in the new PC is to do a clean/new install of the OS.

If for some reason you prefer to use the old OS in the old HD with its settings/configuration, you can try to do a repair/re-install. The procedure is similar to installing a clean/new OS except that you should opt for the 2nd repair choice (not the R or first repair option). This should retain most if not all of your old applications/settings while installing new Windows files.

Hope this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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