Alternate Data Paths

Last post 05-23-2019, 9:42 AM by MWR. 5 replies.
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  • Alternate Data Paths
    Posted: 09-11-2018, 5:04 AM

    Hello

    I have this resource:

    - site A with MA_A and DiskLib_A with GDP_A

    - site B with MA_B and DiskLib_B with GDP_B

    - multiple storage policy SP_SITE_A_xxx (that are dependent from GDP_A)

    I wish to obtain this:

    1) in the primary copy of my storage policy the preferred path MA_A/DiskLib_A and the alternate path (if preferred is not available) MA_B/DiskLib_B

    2) in the secondary copy (synchronous) the preferred path MA_B/DiskLib_B

    is this configuration feasible?

     

    Many thanks

  • Re: Alternate Data Paths
    Posted: 10-05-2018, 10:25 PM
    • MWR is not online. Last active: 06-11-2019, 11:20 PM MWR
    • Not Ranked
    • Joined on 06-22-2010
    • San Clemente CA
    • Newcomer
    • Points 4

    Yes, possible but bad design and no not really feasible with CV dedupe. A design I don't ever implement.

  • Re: Alternate Data Paths
    Posted: 10-12-2018, 5:44 AM

    Hi Mark

    why do you doesn't suggest this configuration?

    how can I achieve a similar result?

     

    Regards

  • Re: Alternate Data Paths
    Posted: 10-15-2018, 10:36 AM

    Hi Mark

    so isn't possible to have another Data Path to the DiskLibrary if the storage policy it's configured with dedup? even if the alternate Data Path would write data without dedup?

    The only solution would be to have a partitioned DDB with 2 Media Agent?

    Regards

     

  • Re: Alternate Data Paths
    Posted: 11-09-2018, 6:18 PM

    Hi Strangedays

    The problem with this type of Configuration is the distribution of the Deduplicated Data (note - CommVault won't allow you to setup this way with GDDB, Per Storage Policy Copy only one GDDB can be associated). 

    If you are going to use Disk_LibB as an additional library to handle the Backup, if Disk_LibA is offline, what will happen is the deduplicated Data will be spread to the Disk_LibB. Now you will end up with two-point of failure, where even one Disk Library is offline (due to Deduplication), the restore might not work. 

    Adding to the fact that this is across two sites, your bottleneck is also the network bandwidth. 

    The workaround is to create another Disk Library using the same Backend Disk Storage as Disk_LibB, and add it to the Data Path. (Again this is not recommended). 

    Hopefully that helps 

    Thank you 

    Winston 

  • Re: Alternate Data Paths
    Posted: 05-23-2019, 9:42 AM
    • MWR is not online. Last active: 06-11-2019, 11:20 PM MWR
    • Not Ranked
    • Joined on 06-22-2010
    • San Clemente CA
    • Newcomer
    • Points 4

    Hi Strangedays,

     

    Sorry, for the very delayed and short response. I don’t often come on the forums and didn’t realize I left this question open. So to answer your question more fully.

     

    You cannot have more than one GDDB per copy. Also, the GDDB must be unique to a Storage Policy as it cannot be utilized by more than one copy.

     

    You could add the remote MA as an additional data path to the same disk library and add as a second partition to the GDDB but this would have very negative effects on regular backups as the performance would likely be drastically poor. Wouldn’t go down this path.

     

    You could add additional data paths to the copy for remote MA for the same local disk library that do not host a DDB for the GDDB but if the primary MA hosting the GDDB fails then it needs to be restored or brought back up. The same could be done by adding another library as a data path to the GDDB but the same limitations apply. Blocks could be written across multiple locations and all would be required for a restore. 

     

    So with deduplication we need a minimum of two DDB partitions each on a local MA utilizing shared storage for the disk library to obtain a redundant solution. Ensure there is enough disk space to allow for additional blocks to be written temporarily if one of the partitions fails. Duplicate this at the other site and I think you will have a good solution. 

     

    Thanks,

     

    Mark

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