HI,

we had to add the parameters

Maximum Block Size = 65536
Maximum Network Buffer Size = 65536

to the device definition in bacula-sd.conf:

Device {
  Name = Drive-1
  Media Type = Ultrium-LTO3
  Archive Device = /dev/st0
  AutomaticMount = yes;
  AlwaysOpen = yes;
  RemovableMedia = yes;
  RandomAccess = no;
  AutoChanger = yes
  Spool Directory = /var/spool/bacula
  Maximum Spool Size = 100G
  Maximum Block Size = 65536
  Maximum Network Buffer Size = 65536
}

The corresponding output of dmesg was 

[ 3299.906724] st0: Failed to read 65536 byte block with 64512 byte transfer.
[ 3856.794626] st0: Failed to read 65536 byte block with 64512 byte transfer. 

Stefan
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