Single instance sharing ratio calculation
Calculation methods
The following table describes the correct method for calculating the single instance sharing ratio for your installation.
If you have...
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Use...
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A new Exchange installation
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1.5 for your single instance sharing ratio. After you have a more mature installation, recalculate the ratio using the procedure below.
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An existing Exchange installation
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The following procedure to calculate the single instance sharing ratio for your installation.
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Calculation guidelines
Use these guidelines when calculating the single instance ratio:
- Track the ratio over time during peak production times, and use the lowest ratio value recorded.
- If you get different ratio values for different databases within a storage group, use the lowest value for that storage group in your calculation.
Calculating the single instance ratio
To calculate the single instance sharing ratio for your installation, complete the following steps.
Step
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Action
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1
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Run the Windows Performance Monitor (perfmon).
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2
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Right-click the graph and select Add Counters.
Result
The Add Counters dialog box is displayed.
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3
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In the Performance Object drop-down list, select the appropriate performance object for your version of Exchange:
- For Exchange 2000 or 2003, select MSExchangeIS Mailbox.
- For Exchange 5.5, select MSExchangeIS Private.
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4
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In the Select Counter From List option, select Single Instance Ratio.
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5
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Select all databases in the instances list for the storage group you are measuring.
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6
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Click Add.
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Calculating the deleted item cache size
To calculate the deleted item cache size for your installation, complete the following steps.
Step
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Action
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1
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Run the Windows Performance Monitor (perfmon).
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2
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Right-click the graph and select Add Counters.
Result
The Add Counters dialog box is displayed.
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3
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In the Performance Object drop-down list, select the appropriate performance object for your version of Exchange:
- For Exchange 2000 or 2003, select MSExchangeIS Mailbox.
- For Exchange 5.5, select MSExchangeIS Private.
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4
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In the Select Counter From List option, select Total Size of Recoverable Items.
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5
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Select all databases in the instances list for the storage group you are measuring.
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6
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Click Add.
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reserved.
Part No. 215-00858
File: preins11.htm
Last updated: Tue Jun 15 15:34:05 2004