[Bacula-users] Writing more than capacity on LTO 4 tape

Hi Guys,

I have an IBM LTO 4 tape library with 4 tape drives . As we know  
capacity of LTO 4 tape is 800 GB.

Today I started a backup with already volume size of 750 GB after some  
time bacula marked volume as FULL and started writing to next volume.  
But after completion of job I seen that it is showing 850 GB data in  
tape one and around 70 GB data in tape two. I have tested a restore  
from these volumes. Which is working fine.

output of list media command is below:


Pool: BACKUP
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
| MediaId | VolumeName | VolStatus | Enabled | VolBytes        |  
VolFiles | VolRetention | Recycle | Slot | InChanger | MediaType |  
LastWritten         |
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
|      20 | A00040L4   | Full      |       1 | 895,721,637,888 |       
115 |       10,800 |       1 |    1 |         1 | LTO-4     |  
2013-09-27 15:40:11 |
|      21 | A00041L4   | Append    |       1 |  74,331,177,984 |        
10 |       10,800 |       1 |    2 |         1 | LTO-4     |  
2013-09-27 15:52:35 |
|      22 | A00042L4   | Append    |       1 |          64,512 |        
  0 |       10,800 |       1 |    3 |         1 | LTO-4     |  
0000-00-00 00:00:00 |
|      23 | A00043L4   | Append    |       1 |          64,512 |        
  0 |       10,800 |       1 |    4 |         1 | LTO-4     |  
0000-00-00 00:00:00 |
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+



Please tell me why this is happening. although it happens first time  
with me. :-)

how it is possible to write 850 GB of data on a tape with 800 GB capacity?


Thanks in Advance...!


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