optimize tape usage and hours RRS feed

  • Question

  • HI,

    when using the optimize tape feature I have following problem. 

    Using DPM 2012 SP1. 

    I can only set days, eg:  0 days 1 day, 2 days and so on. 

    What I want to achieve is, that multiple protection jobs get onto the same tape. 
    But once the job is finished, it should be marked as offsite ready, I don't want to wait for 24 hours that it sais, offsite ready. 
    a backup jobs takes daily about 1 1/2 tapes. 

    Now I see following: 

    - I set it to 0: Each protection group aren't combined, but are written to separate tapes. Most like as once protection group 1 is ready, it unloads it and marks it as offsite ready, so for the next protection it has to load a new tape. (The need to load/unload a tape with this optimized tapes doesn't make sence anyway, as it does it always, not matter if it's set to 0, 1, 2,...). 

    - I set it to 1: I have to wait until the next backup starts, before it marks the tape as offsite ready. (24 hours as we do daily on tape) which is basically not useful, as if the tapes are still in there, it could write all tapes full and daily backups have to wait for 1 day to be marked as offsite ready. 

    - I set it to 2: This would write all tapes full but you have to wait 48 hours. 

    The only solution I see is: 

    - If i set the Tapewriteperiodratio to 12 hours, or 6 hours, whatever, it would combine protection groups and mark it offsite ready earlier. But in the GUI only 1 day is possible, I can't set hours. 

    I found this command but not quite sure about the percentage (fraction) used: 
    Set-DPMGlobalProperty –DPMServerName <dpm server name> -TapeWritePeriodRatio <fraction>

    It sais the fraction is calculated according to the retention period. 
    But we have daily 7 days, weekly 8 weeks, monthly 12 months. 
    Percentage would not work for all 3 types, what am I getting wrong here or can it be achieved a different way?



    Monday, June 3, 2013 5:28 PM


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    Tuesday, September 3, 2013 7:31 PM