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We have several branch offices which mostly have only one server for different purposes.

These servers are also used as media agents with standalone tape drives.

Some of these servers have USB-sticks installed which are needed for licensing purposes.

Unfortunately this seems to have an impact on the way Commvault detects the access path of the tape drive.

For example the tape drive is usually accessible on \\.\Tape0.

When a USB-stick is installed its access path gets detected for the tape drive e.g. \\.\PHYSICALDRIVE2.
From the SCSI Scan it seems like the USB-stick is (virtually?) assigned to the same SCSI id as the tape.

 

I tried configuring the drive without the USB installed, but after the next SCSI Scan occurs, it causes the access path to change again.

 

Is there a way to correct this behaviour or stop new SCSI scans after the initial configuration?

SCSI IDs are managed by the operating system, so Commvault is just reading that from the OS and should not be influencing the IDs at all. I found several past cases where this has occurred to other customers with no real solution other than disabling the USB device.

It might be worth using ScsiCmdTool to further investigate / troubleshoot the IDs. Otherwise, try see if any of the PNP library options may apply here; https://documentation.commvault.com/2023e/expert/pnp_plug_and_play_disk_libraries.html

This setting looked interesting - but I have no idea if it would help or not:

https://documentation.commvault.com/additionalsetting/details?name=%22nConsiderRemovableMediaAsTape%22

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