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Dav1234's avatar
Dav1234
Level 5
7 months ago

Can we use MSDP at source side and DD at target side

Hello Experts,

Can we configure MSDP and source domain and DD at target domain? in this case will replication work?

20
Linux

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  • StefanosM's avatar
    StefanosM
    Level 6
    7 months ago

    Technically YES but NO.  Do not try it

    Every OST device has its own deduplication engine. If you try to duplicate backups from an OST device to a different OST device you will loose the optimized duplication.

    So the source media server will rehydrate the backup from the MSDP pool, send it to the target media server who re deduplicated it and send it to the DD.

    • L_BR's avatar
      L_BR
      Level 5
      7 months ago

      After an initial duplication (MSDP to OST), would the plugin (DDboost I think its called unless they've changed it) on the external media server not be able to only duplicate the changes? 

      I am deduplicating FlexScale MSDP (whatever its called with FS) to NEC Hydrastor. I got it from the storage developer that the first duplication will take long, afterwards the plugin will kick in and after rehydrating the images, it will send changes only. 

  • StefanosM's avatar
    StefanosM
    Level 6
    7 months ago

    yes, if the plugin is on the same server.

    But as you said it will rehydrate all data (do a full restore to the media server), deduplicate it again and send only the new blocks to the DD.

    For small installations or small backups it is ok. For bigger customers is a "no go".  It needs CPU, memory and free time on the media server.

    at the end is a trial and error procedure.