CDR Replication

Last post 10-31-2012, 11:06 AM by JMichael. 9 replies.
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  • CDR Replication
    Posted: 10-27-2011, 1:02 PM

    CheckSum Calculation is taking 17 - 24 hours  this does not seem normal.

     

    Anyone seen this happen before?

     

  • Re: CDR Replication
    Posted: 10-27-2011, 1:11 PM

    17 - 24 hours????  What!!!   Surprised

    Yeah it's normal.  ;-)  Some pairs in my environment over our slower wan connections (T1) take between 2-5 days.  Yep, days.  The option in version 9 which optimizes does a block level comparison of the files and this is why you're seeing long checksum phases.  I'm using CDR for exchange.  I've seen logs grow from 10-80GB during checksum phases in my environment.  As long as you have space on source and destination to handle these long checksum phases it should not be an issue.

    For example, right now I have a location that is on day 3 of checksum and has 60GB of logs on source and destination.  Since my source is sending to my destination with no issues I will let the pair continue.  As soon as checksum completes logs get replayed and will clear within minutes so I'm not worried.  I just make sure to check in on these pairs during this phase.

  • Re: CDR Replication
    Posted: 10-27-2011, 5:14 PM

    ok next question..

     

    is it normal for the state to change to CheckSum Calculation (Not verifiable)

  • Re: CDR Replication
    Posted: 10-27-2011, 5:34 PM

    I wouldn't consider it normal, but it does not indicate an error and should not be alarming.  Are you not running version 9?  I remember having this error in the past but ever since being on version 9 its no longer present.  The "not verifiable" is CV's way of indicating its not able to calculate when the job will complete or determine the size of the data to move.  It's something that should not really be there.  In the background all the data being moved is being checked and won't cause issues.  I used to see this error in version 8 when my rep pairs ran the time spans that you are indicating.

  • Re: CDR Replication
    Posted: 10-27-2011, 5:46 PM

    We are running V8 sp6..

     

    I have looked at other checksum calculation times on the pair and it is usually minutes not hours..

     

    I don't see any data on the pair in question.

    i guess i will give it the night and see what things look like in the morning.

  • Re: CDR Replication
    Posted: 10-27-2011, 6:01 PM

    What type of data are you replicating?  Is this standard CDR or APP detected?

    What is the link speed between destination and source?

    Was data already on the destination or is this a new baseline?

    If you right click the pair > all tasks > manage pairs: do you see "include files that do not match on with destination copy".  Is this option checked?

    Are log files building on the source?  If they are, are they staying current on the destination?

    Do you have large VSS snaps on your source machine?  Use "diskshadow" or "vssadmin" to check how many and what size.

     

     

  • Re: CDR Replication
    Posted: 10-28-2011, 11:31 AM

    What type of data are you replicating?  Is this standard CDR or APP detected?

    standard CDR.

     

    What is the link speed between destination and source?

    we have it throttled to 50 Mbps durning peek hours.

     

    Was data already on the destination or is this a new baseline?

    Data already on the destination. (however a large data volume was just backed up aprox 2 TB)

     

    If you right click the pair > all tasks > manage pairs: do you see "include files that do not match on with destination copy".  Is this option checked?

    Don't have that option..

     

    Are log files building on the source?  If they are, are they staying current on the destination?

    log files are buliding on the source.. but not stay current on the destination.

     

    Do you have large VSS snaps on your source machine?  Use "diskshadow" or "vssadmin" to check how many and what size.

    no..

  • Re: CDR Replication
    Posted: 10-28-2011, 1:57 PM

    Data is moving now... woohoo!

     

    thank you for you time

  • Re: CDR Replication
    Posted: 10-30-2012, 7:08 PM

    Hello Michael,

     

    I have the same CDR problem/issue with my Commvault 8 SP6.

    Current status - CheckSum Calculation (Not verifiable). This is the first replication and the source server holds about 3 TB of data. 

    Speed between sourse and dest - 100Mbps (during business hours - just ~15%).

    Your last message was that data is finally started to move :)

    Could you please to share what did you done with your Commvault settings ? :) Or it just started after some waiting time ? :)

    Thanks you very much !

  • Re: CDR Replication
    Posted: 10-31-2012, 11:06 AM

    It has been a while but I do believe I just left it and it eventually started to replicate.

    In the past I have also rebooted the media agents as well.

     

    jm

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