Application read size is the size of the application data read from the clients for data transfer during backup operations. Values for Application Read Size must be in the power of 2; default value is 512 KB, maximum value is 4096 KB (4 MB).
Note that each application internally allocates a buffer size that is suitable for handling the application data. When the size of the application data read during backup operations matches the source application's internal buffer allocation then the overhead is minimized. So to achieve optimal rate of data transfer during backups, configure this value based on the source application's buffer allocation.
The value of application read size may be increased to reduce the amount of data read from the given application, which in turn reduces the amount of I/O operations performed against it. As a result, overall backup performance may increase. However, backup memory usage may also increase, which may inadvertently consume additional resources from the application. Thus, it is recommended that this value be set at either the default value or match the block size directed by the application.
This configuration is supported for the following agents:
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Microsoft Windows File System Agent
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Microsoft SQL Server Agent