We here use different HP ProLiant servers, all of them with Windows Server 2012 R2 and latest updates from MS and latest HP ProLiant Service Pack, which should bring tape drivers from HP. We can see the medium changer and the tape drives of the connected HP MSL libraries.
Later I can check, what kind of drivers and versions are used.
If this is finally finished and up-to-date, we install VBR here and I really like it, that VBR doesn't include any tape drivers, they simply concentrate on their software and let manufacturers do their job. Pretty clever, if you ask me.
We used to have Veritas Backup Exec v10 and v11, as well as Symantec Backup Exec v12, v12.5, v2010, v2012, v2014 and now Veritas Backup Exec 15 and it was always a mess to find out, if HP tape drivers are necessary or should be re-placed with Backup Exec drivers or not.
Even Symantec or Veritas NetBackup is a mess regarding, what drivers to use and what drivers not to use for several different backup hardware.
Veritas Backup Exec 15 (v-Ray) is a nice and reliable software, but it's old-school. The v-Ray version of Veritas Backup 15 is still inferior in comparison to VBR in several aspects and even Veritas NetBackup v-Ray is not much better. NetBackup is full of nice options but it really overloads you.
Using Veeam Backup & Replication 9.5 Update 2 on every backup server here!