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Mailbox Assistant CPU Utilization Exchange 2010 - Correct Threshold 5% or 98.9% RRS feed

  • Question

  • According to Microsoft (http://technet.microsoft.com/en-us/library/ff367871(v=exchg.141).aspx), the Mailbox Assistant should not consume more than 5% CPU.

    Counter Description Threshold

    Process(MSExchangeMailboxAssistants)\%Processor Time

    Shows the amount of processor time being consumed by mailbox assistants.

    Should be less than 5% of overall CPU capacity.

    We are seeing this counter consume over 5% CPU many times any given day.

    After Exchange 2010 RTM, starting with SP1 (http://technet.microsoft.com/en-us/library/bb123958(v=exchg.141).aspx), Microsoft changed the Mailbox Assistant to a throttled process instead of a scheduled process.  Is this 5% Threshold Still valid?   I am trying to figure out if seeing this counter over 5% is really an issue.  I did find this (http://technet.microsoft.com/en-us/library/ff360612(v=exchg.140).aspx), for System Center Operations Manager.  This seems to indicate to me that Microsoft changed the value in System Center Operations Manager to 98.9% but has not updated documentation for those using PowerShell Scripts. So should the MSExchangeMailboxAssistants threshhold be 5% or 98.9% for SP1 and beyond?

    Product Name

    Exchange

    Product Version

    14.0 (Exchange 2010)

    Object Name

    Process

    Counter Name

    % Processor Time

    Instance Name

    MSExchangeMailboxAssistants

    Sample Interval

    180

    Server Role

    Ex14. Mailbox

    Critical Error Threshold

    98.9

    Rule Path

    Microsoft Exchange Server/Exchange 2010/Mailbox/Assistants

    Rule Name

    MSExchangeAssistants CPU

    Hopefully, I can get a link to Microsoft documentation or a response from Microsoft.  I would like something definitive if possible.

    Thanks!




    • Edited by OldestGrom Wednesday, May 15, 2013 4:30 PM
    Wednesday, May 15, 2013 4:27 PM

Answers

  • Hi

    It should be 5%.

    And 98.9 is a Critical Error Threshold value.

    Cheers


    Zi Feng
    TechNet Community Support

    • Marked as answer by OldestGrom Thursday, May 23, 2013 2:58 PM
    Thursday, May 16, 2013 9:11 AM
    Moderator

All replies

  • Hi

    It should be 5%.

    And 98.9 is a Critical Error Threshold value.

    Cheers


    Zi Feng
    TechNet Community Support

    • Marked as answer by OldestGrom Thursday, May 23, 2013 2:58 PM
    Thursday, May 16, 2013 9:11 AM
    Moderator
  • Zi,

    I take this to mean 5% should be the warning value and 98.9% the critical value.  Please confirm.

    Thank you!

    Tuesday, May 21, 2013 8:02 PM