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DLO de duplication

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I need a solution

If we enable de dup for user backup , and we are backing up 1 GB of data  how much data will be occupied in the de dup storage location .

 

The results have been varied till now

 

Our results

  1.       Backup_test1

Data Backed up from Laptop = 2.97 GB; Dedupe = 51 MB; Storage Pool = 535 KB

 

  1.       Backup_test2

Data Backed up from Laptop = 2.97 GB; Dedupe = 555 KB; Storage Pool = 535 KB

 

  1.       Backup_test3

Data Backed up from Laptop = 2.97 GB; Dedupe = 555 KB; Storage Pool = 535 KB

 

  1.       Backup_test4

Data Backed up from Laptop = 2.97 GB; Dedupe =  1GB; Storage Pool = 535 KB

  1.       Backup_test1

Data Backed up from Laptop = 2.97 GB; Dedupe = 51 MB; Storage Pool = 535 KB

 

  1.       Backup_test2

Data Backed up from Laptop = 2.97 GB; Dedupe =  900 MB ; Storage Pool = 535 KB

 

  1.       Backup_test3

Data Backed up from Laptop = 2.97 GB; Dedupe = 555 KB; Storage Pool = 535 KB

 

  1.       Backup_test4

Data Backed up from Laptop = 2.97 GB; Dedupe = 555 KB; Storage Pool = 535 KB

 

WHy is there this differnce in space occupied by de dup storage location . How can we estimate the storage space to give


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