backup to robotic tape with symantec bakup exe

i use robotic library of ibm to backup my servers and i use symantec backup exe 12 now my all size of data is about 1tb and i use cardrige 800gb/1.6tb lto ultrium but i see that the backup take two tape cardrige ,but i want that the backup will be to one tape how i do this??
buildingitAsked:
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Miguel Angel Perez MuñozCommented:
Your native capacity is 800gb and compressed 1,6Tb.Since you have got about 1Tb it is possible can not be on one tape and require two of them. This depends of "compressibility" of data.
Check on tape what is compression level, because 1,6Tb is very optimistic compression rate (2:1), on my fileservers compression rate is 1,35:1.
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buildingitAuthor Commented:
where i check the compression level????
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Miguel Angel Perez MuñozCommented:
On media (or storage, my backup exec is not in english), search and select one tape you have used, left button, properties.
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buildingitAuthor Commented:
i see just that hardware compression is enable
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Miguel Angel Perez MuñozCommented:
But this compression depends of data. You are using cartridges that could be store 1,6Tb but real capacity is only 800gb. Since 800 is less that your total data volume, depends how many can be compressed this data.
Your backup can not be fitted on only one cartridge because your compression rate is below 2:1, you can check on one cartridge you have used, here can obtain statistics about cartridge usage, free space and compression rate. You can check your compression is below 2:1 and this causes you need two cartridges.
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Gerald ConnollyCommented:
@buildingit
1) Why does it matter for you to have all of your backup on one tape if it is in a Tape Library?
2) If it has to be on one tape, then reduce the amount of data you back up. There are several ways to do this, but be warned Data always grows, so it will only be a short term fix.

Ways to reduce data being backedup.
1) Exclude files that never change, Archive them once and then exclude them from your backup.
2) Remove all log files and temporary files before backup.
3) Consider using a "Synthetic Fulls" and "Incrementals Forever" strategy.

And of course you could always upgrade from your LTO-4's (800GB) to LTO-5's (1500GB) or even LTO-6 (3200GB)
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