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Byte Count vs Tape Capacity

I need a solution

Backup Exec 2010 R3 Service Pack 4 - Small Business Server Suite  (Media Server Version 13.0 Rev 5204 (32-bit).  Administration Consol Version 13.0 Rev 5204.1270 (32-bit) Desktop and Laptop Option Version 3.1 Rev 3.46.06a.  FIPS version - not enabled.

Server 2003 with a Quantum Ultrium 3 deck.

I'm trying to figure out why a client's backup job has stopped completing succesfully.  The size of the back up has grown steadily in the last few months mostly due to Exchange growth and the number of Quickbook backups they are keeping.  The jobs are failing indicating the backup window has expired.  The jobs typically complete in 2hrs, the windows is 6hrs.  After troubleshooting I find that the tapes are full.  I have done the following since making this determination.

- Checked overwrite and apend settings.  For purposes of trying to get successful backup I have set overwrite protection to none and apend to infinite.  The job is set to use hardware compression if available otherwise software.

- Did a quick erase, verified the tape was 'blank' and put the tape back into the correct media set.

- Ran a successful test job that shows the total byte count of 201,976,547,800 bytes or about 188GB. It further shows an Online overwrite capacity of 400,308.00MB or about 390GB which is what the physical tape shows under Devices. 

- I went through and deleted about 40GB of data to reduce the size of the backup job.

Ok.  So I ran a job last night.  The result - it failed.  I assume it was waiting for a second tape.  The tape is now full showing used capacity is 389.7 GB of 390.9 GB available.  Ok. The tape is full.  However, byte count in the job monitor is showing a byte count of 183,392,700,450 bytes or about 170GB.   In my job history I have successful jobs on a single tape that were 246,688,635,872 bytes or about 229GB.  

So I expect with compression to have the ability to backup ~300GB of data.  Yet my blank tape is full at 390GB but I have a byte count of 170GB.   I know I'm missing something here but I can't figure it out - never had a BE problem in 15 years that I couldn't figure out myself.  I'm open to any suggestions.  Thanks.

Mike


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