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I/O Performance impact of running Start-DedupJob with –Priority High

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My name is Steven Andress and I am a Support Escalation Engineer with Microsoft’s Platforms Support Team.  This is a short blog post to alert you to a condition you might encounter when running a deduplication job using the Start-DedupJob PowerShell cmdlet. 

Start-DedupJob
https://technet.microsoft.com/en-us/library/hh848442.aspx

Start-DedupJob [-Type] <Type> [[-Volume] <String[]> ] [-AsJob] [-CimSession <CimSession[]> ] [-Full] [-InputOutputThrottleLevel <InputOutputThrottleLevel> ] [-Memory <UInt32> ] [-Preempt] [-Priority <Priority> ] [-ReadOnly] [-StopWhenSystemBusy] [-ThrottleLimit <Int32> ] [-Timestamp <DateTime> ] [-Wait] [ <CommonParameters>]

The Start-DedupJobcmdlet starts a new data deduplication job for one or more volumes. The Priority setting sets the CPU and I/O priority for the optimization job you run by using this cmdlet.  The only way to run a Deduplication job with High Priority is to use the cmdlet.  When Priority is set to High, I/O for other processes using the volume may be slowed down or even blocked.   If this is a Cluster Shared Volume (CSV), I/O to the volume from other nodes can be similarly impacted.   

Workaround:
Do not use "-Priority High" when starting dedup jobs if this is server is in production hours.  If you wish to use this switch, please ensure that it is done after hours so that productivity is not affected.

Regards,
Steven Andress
Senior Support Escalation Engineer
Microsoft Corporation

Comments

  • Anonymous
    January 01, 2003
    The comment has been removed
  • Anonymous
    January 09, 2014
    226 Microsoft Team blogs searched, 16 blogs have new articles. 32 new articles found searching from 30
  • Anonymous
    January 13, 2014
    Hi Everyone, A short one this week as it was a quiet time over the Christmas and New Year period.
  • Anonymous
    December 01, 2014
    The comment has been removed
  • Anonymous
    February 24, 2015
    I wrote a blog post on how to make windows deduplication run faster:

    http://windowsdeduplication.com/how-to-make-windows-deduplication-go-faster/

  • Anonymous
    March 18, 2015
    The comment has been removed
  • Anonymous
    July 27, 2016
    Comme mon pére disait toujours! l'intervention renouvelle les paramètres systématiques de la démarche