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buildingitFlag for Afghanistan asked on

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??
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Gerald Connolly

8/22/2022 - Mon
Miguel Angel Perez Muñoz

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.

where i check the compression level????
Miguel Angel Perez Muñoz

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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William Peck

i see just that hardware compression is enable
Miguel Angel Perez Muñoz

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.
Gerald Connolly

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