Tape Positioning Error

[Jeffery Banning]

I am battling a consistent error when attempting to write multiple jobs to a single tape drive, no autochanger.   Most of the jobs are migrations from primary disk backup to archival tape.   New tapes work fine.  Appending to a tape that has not been unmounted works fine.  Where I run into problems is if I unmount a tape that has space available and then remount it.   I always get this error:

Tape1-SD JobId 66012: Error: Unable to position to end of data on device "Tape1" (/dev/nst0): ERR=backends/generic_tape_device.cc:223 ioctl MTIOCGET error on "Tape1" (/dev/nst0). ERR=Success.

Not a huge deal but I am wasting alot of tape space if I have to put in a new tape.  The tape drives are HP LTO-6.   I am assuming I have a device configuration issue, but I am not sure where to look.  Below is my Tape config.

Any suggestions would be appreciated.

Device {

  Name = Tape1

  Media Type = LTO-6

  Archive Device = /dev/nst0

  AutomaticMount = yes;               # when device opened, read it

  AlwaysOpen = yes;

  RemovableMedia = yes;

  RandomAccess = no;

  AutoChanger = no;

  Minimum block size = 1048576;

  Maximum block size = 4M;

  Maximum File Size = 20GB;

  LabelMedia = yes;                   # lets Bareos label unlabeled media

  Random Access = no;

  AutomaticMount = yes;               # when device opened, read it

  RemovableMedia = yes;

  AlwaysOpen = yes;

  Maximum Spool Size = 150GB;

  Description = "Tape Drive #1."

}