Forum Discussion

duyphi's avatar
duyphi
Level 3
12 days ago

How can I find out the actual size of a backup after compression and deduplication ?

Hi everyone,

I am using Veritas NetBackup version 11 to backup Oracle databases and all virtual machines in a quite big system. The using experience is nice and smooth, but my boss want me to show him the exact actual size of a backup after being backed up successfully. This means the actual size of a backup after being deduplicated. How can I find this statistics ? The Activity monitor in NetBackup Web UI shows the logical size and the deduplication ratio of each job ID, but it is suffering to manually sum them up =)))

So, I really want to know that: Are there any faster ways to get the actual size of a backup after being deduplicated ? And if the only way to do that is manually calculating, what is the correct formula when I know the logical size and the deduplication ratio ?

actual size of a backup
Deduplication
NetBackup
Netbackup 11
size of the backup file
size of the original file

2 Replies

  • StefanosM's avatar
    StefanosM
    Level 6
    12 days ago

    This is available only if you’re using NetBackup IT Analytics.
    You can refer to the report “NetBackup Deduplication to MSDP Savings - By Clients”, although it may not be entirely accurate since the data is collected from the it analytics database rather than directly from the deduplication engine, and expired data are included in the calculation. 
    However, the percentage value is fairly accurate.

     If you can write scripts, you can use bpdbjobs -all_columns command to gather activiti monitor data and isolate "CR sent" and "dedup space saving" for every backup job.
    Still you have to do a lot of work as  you do not have the initial data you have to calculate them.

    I do not know a backup software that have this information you asked out of the box, with one possible exception one.

    • duyphi's avatar
      duyphi
      Level 3
      11 days ago

      Hi StefanosM,

      Thanks a lot for your detailed explanation - really appreciate you taking the time to break that down. Good to know about the "NetBackup Deduplication to MSDP Savings - By Clients" report and the "bpdbjobs -all_columns" command. Sound likes it'll take some extra work, but at least now I've got a clearer idea of where to start.

      Thank you again for sharing your insights !