Backup Exec 12.0 Using Hardware Compression

I am having issues with my backups which are done using Symantec's BACKUP EXEC 12.0, v. 1364 running on Windows 2003 Small Business Server, SP 2. Recently, I started having an issue where the compression of data did not work causing my tapes to get filled. Previously, the compression ratio would be about 1.9 : 1 meaning about 60% of my tape was used. FYI, I'm using DELL LTO-3 tapes with 400GB native size. ALl the drives being backed up are not compressed on the disk... I know that would negate the compression used by my backup system.

I have run some tests by taking random samplings of the data that is backed up using the current job settings of hardware compression if any or none. THe results are data is compressed. I have researched numerous sites including one which talked about SCSI trace utility that comes with the BE package.

My question right now is very basic, although follow up questions could spawn from this. Once a backup job starts and the hardware selects the compression mode, can compression get turned off during the job? If so, then what turns it back on?
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Iamthecreator OMIT AdminCommented:
Once a backup job starts and the hardware selects  the compression mode, can compression get turned off during the job? If  so, then what turns it back on?: YES , but in very rare case and even then it would either be an incompatibility issue or defect in the BEWS application.
There are 2 ways to confirm that .
use SGMON or check the drive properties to see if the compression check mark is getting cleared

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rpbishipAuthor Commented:
Unfortunately, SGMON would not show me that the compression was getting turned off, yet I know it did. Since the only thing that changed were new DELL tapes (for a DELL PV 124T), I put an old tape back in for the next run. Ran as expected. Conclusion is must be the tapes. Next call is to DELL.
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