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yguilloux's avatar
yguilloux
Level 4
10 years ago
Solved

AIR replication restart

Hello

I have a question regarding deduplication and AIR : when a replication is interrupted for any reason (link failure, server reboot, ....) are the block already sent to the other site totaly lost ? With other words, when the replication is restarted (from 0 of course) , is it really not optimized (supposing it is the first time it runs) or the first part of the replication can take advantage of already sent blocks ?

I imagine the blocks received by the remote MSDP are stored then could be potentially be used ... but maybe they are flagged "to be deleted" when the replciation process is broken and then can not be used ...

If anybody has knowlegde or ideas on this point ....

Best regards

Backup and Recovery
Deduplication Option
NetBackup
Windows Server (2003-2008)
  • Michal_Mikulik1's avatar
    Michal_Mikulik1
    10 years ago

    Hello,

    refer to GarbageCheckRemainDCCount parameter in Dedup Guide:


    The number of containers from failed jobs not to check for garbage. A

    failed backup or replication job still produces data containers. Because

    failed jobs are retried, retaining those containers means NetBackup

    does not have to send the fingerprint information again. As a result,

    retried jobs consume less time and fewer system resources than when

    first run.

    Rgds

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  • sdo's avatar
    sdo
    Moderator
    10 years ago

    *bump*   (...because I like this question... does anyone know?)

  • Michal_Mikulik1's avatar
    Michal_Mikulik1
    Moderator
    10 years ago

    Hello,

    refer to GarbageCheckRemainDCCount parameter in Dedup Guide:


    The number of containers from failed jobs not to check for garbage. A

    failed backup or replication job still produces data containers. Because

    failed jobs are retried, retaining those containers means NetBackup

    does not have to send the fingerprint information again. As a result,

    retried jobs consume less time and fewer system resources than when

    first run.

    Rgds

  • yguilloux's avatar
    yguilloux
    Level 4
    10 years ago

    Thanks a lot for this information !

     

    Does this mean that failed/retried jobs are keeping some DCs, but cancelled ones do not ?

  • sdo's avatar
    sdo
    Moderator
    10 years ago

    A cancelled job is a failed job.  I would expect the same DC / garbage rules to apply to any failed job no matter what the status is.  I would expect the garbage DCs to only exist (be retained) for a specific length of time.

    What is not clear to me is...

    1) Are all garbage DCs deleted when garbage DC expiry runs no matter how old they are?

    2) Or, are garbage DCs aged, and when garbage DC runs is it only those garbage DCs that are over a certain age which are deleted?