How long for DPM to perform a backup to VTL? RRS feed

  • Question

  • Hello,

    Can anyone advise how to calculate the duration for a DPM backup (include MBS and dedup)

    Using 10TB as the dataset and using 1GB bandwidth

    How long for a 1st full backup?

    How long for an incremental daily backup?

    How long for a weekly backup?

    How long for a monthly backup?

    Many thanks.

    Regards Peter

    Wednesday, June 20, 2018 10:39 AM

All replies

  • Hi!

    I'm afraid this is very difficult to calculate or estimate, as speeds vary a lot, and there's other things going on in the network always, which means you cannot keep a constant bandwidth speed.

    The best way to get an estimation is to follow up the backup trend and calculate an average of that.

    But doing a VERY simple calculation:


    • 10TB (10000GB or 10240000MB)


    • 1GBbps (1000Mbps ~125MB/s)

    10240000MB ÷ 125MB = 81920

    So it will take 81920 seconds to transfer 10TB of data at full speed.

    To get this in minutes: 81920s ÷ 60 = 1365.33min

    To get this in hours: 1365.33...min ÷ 60 = 22.75...h

    Best regards,

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    Wednesday, June 20, 2018 1:28 PM
  • Thanks for the example.

    That shows the transfer of data estimate but i am wondering about the actual DPM compression and dedup process and how long that takes, as i understand it does that before it transfers it out to the storage (disk).

    Any idea how to calculate the DPM process?


    Regards Peter

    Friday, June 22, 2018 1:44 AM
  • Hi,

    we are running quite a lot DPM servers with VTLs.

    It is not really possible to calculate that.

    There are so many points that can have an affect on this:

    - speed of storage
    - speed of VTL
    - DPM does not dedup on Tape (DPM does not dedup anyway)
    - type / amount of files
    - configuration of DPM Server / OS




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    Tuesday, June 26, 2018 7:00 AM