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There is an input/output (I/O) size mismatch on the log file.

There_is_an_input_output__I_O__size_mismatch_on_the_log_file (Rule)

Knowledge Base article:

Summary

This is an I/O error. An unexpected error was encountered while reading the file specified in the message.

Resolutions

This error is typically benign. Unless other symptoms occur with it, you can ignore it.

External

For more information about ESE event 444, see:

Element properties:

TargetMicrosoft.Exchange.Databases
CategoryEventCollection
EnabledTrue
Event_ID444
Event SourceESE
Alert GenerateTrue
Alert SeverityWarning
Alert PriorityNormal
RemotableTrue
Alert Message
There is an input/output (I/O) size mismatch on the log file.
{0}
Event LogApplication

Member Modules:

ID Module Type TypeId RunAs 
EventDS DataSource Microsoft.Windows.EventProvider Default
GenerateAlert WriteAction System.Health.GenerateAlert Default

Source Code:

<Rule ID="There_is_an_input_output__I_O__size_mismatch_on_the_log_file" Enabled="onEssentialMonitoring" Target="Exch2003Core!Microsoft.Exchange.Databases" ConfirmDelivery="false" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="EventDS" TypeID="Windows!Microsoft.Windows.EventProvider">

      <ComputerName>.</ComputerName>

      <LogName>Application</LogName>

      <Expression>

        <And>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>Channel</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>Application</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>EventDisplayNumber</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>444</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>PublisherName</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>ESE</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

        </And>

      </Expression>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="GenerateAlert" TypeID="SystemHealth!System.Health.GenerateAlert">

      <Priority>1</Priority>

      <Severity>1</Severity>

      <AlertOwner>$Data/PublisherName$</AlertOwner>

      <AlertMessageId>$MPElement[Name="There_is_an_input_output__I_O__size_mismatch_on_the_log_file.AlertMessage"]$</AlertMessageId>

      <AlertParameters>

        <AlertParameter1>$Data/EventDescription$</AlertParameter1>

      </AlertParameters>

      <Suppression>

        <SuppressionValue/>

      </Suppression>

    </WriteAction>

  </WriteActions>

</Rule>