Unable to recover space on EMC ECS

Last post 10-25-2019, 5:27 PM by Wwong. 7 replies.
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  • Unable to recover space on EMC ECS
    Posted: 10-18-2019, 9:35 AM

    We are using EMC ECS as a backup target.  When data is pruned, the ECS is not reclaiming that space.  It moves the space to a UN-RECLAIMABLE.  Has anyone ran into this issue on ECS and were you able to resolve it.  

  • Re: Unable to recover space on EMC ECS
    Posted: 10-18-2019, 10:08 AM

    If this just simple backups ? or are you using intellesnap?

  • Re: Unable to recover space on EMC ECS
    Posted: 10-18-2019, 4:01 PM

    The ECS is not the backup client, it is a storage library.  We wrote to it from Commvault.  When we pruned the data, the ECS garbage collector marked the space as un-reclaimable.  I just wondered if any one has used ECS as a storage library and also ran into this issue.  This seems to be n issue only with disk space used by Commvault.

  • Re: Unable to recover space on EMC ECS
    Posted: 10-18-2019, 6:11 PM

    Ok - so are all the jobs written to this storage library -- what kind of backup is it? file level, vm snap . intellesnap? I ask because they all age and prune differently

  • Re: Unable to recover space on EMC ECS
    Posted: 10-21-2019, 8:11 AM

    Aux jobs for both file level and vm snaps.

  • Re: Unable to recover space on EMC ECS
    Posted: 10-22-2019, 4:12 AM

    Hi jdutro 

    That doesn't sound right. After pruning of the Commvault CHUNKs/Volume from the ECS (configured Library) this should free up the space. 

    Have you engaged support, this might be a configuration or setting that needs to be applied here to allow pruning to reclaim this space. 

    What version of Commvault are you on? Are you writing Deduplicated or non-deduplicated data?

    Does EMC have any information under what circumstances does the data become unreclaimable?

    Regards

    Winston 

  • Re: Unable to recover space on EMC ECS
    Posted: 10-25-2019, 8:22 AM

    We are working with EMC on the issue.  The only thing we have been able to find is an EMC document for ECS and Commvault config with the following information regarding the additional settings tab.

    nCloudPageModeSubFileSizeKB:
    Description: Used to set the size of the chunks to upload for the files in page mode.
    Default value: 8192
    Use: This parameter sets the chunk size (page mode) of files to upload to ECS when using
    deduplication.
    Note: This parameter sets the deduplication chunk size. Caution should be taken when modifying
     this value because it has the potential to cause large amounts of un-reclaimable garbage in ECS.
     
    I have not been able to find and docs on this additional setting.  Our EMC reps know who wrote this 
    document and they are going to reach out to that person to see if they have more info on the issue.
  • Re: Unable to recover space on EMC ECS
    Posted: 10-25-2019, 5:27 PM

    Hi judtro

    The Additional Setting "nCloudPageModeSubFileSizeKB" is not an exposed setting within Commvault, as the change in CHUNK/Subchunk size could cause pruning performance issue and should only be advised for usage after consulting Commvault Support

    Regards

    Winston 

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