During a block-level backup, the database is backed up in 4096 KB (4 MB) extents by default; however, you can change the extent size using the dwBackupExtentSizeInKB additional setting.
Before You Begin
Consider the following before you change the size of the extents:
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When you decrease the size of the extents, the metadata for the extents increases the size of the index cache. In addition, it might take more time to perform browse operations.
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When you increase the size of the extents, there is more data to restore, which might be the same as restoring the entire database.
Procedure
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On the client where the agent is located, add the dwBackupExtentSizeInKB additional setting as shown in the following table.
For instructions about adding the additional setting from the CommCell Console, see Adding or Modifying Additional Settings from the CommCell Console.
Property
Value
Name
Category
MSExchangeDBAgent
Type
Integer
Value
Enter a value in KB.
The value must be a multiple of 32. If the extent size that you define is not a multiple of 32, the size is automatically adjusted to the nearest multiple of 32 that is less than the defined value. For example, if you enter a value of 60 KB, it will be changed to 32 KB.
The minimum size should be equal to and not less than the Exchange database page size, which is 32 KB.