The Session Clustering module has two methods of writing session information. Each method provides enhanced capabilities in different areas and should be selected according to organizational preferences.
The methods are:
Memory
Disk - Within the Disk storage model are two methods:
Write Through
Delayed Write
The Memory method stores session information to the memory based on the memory allocate for this purpose by the Platform installer. The Memory method is a solution for temporarily storing session information that does not need to be permanently stored. All session information is deleted from the memory once the server is restarted.
The "Write Through" method immediately writes session information to both memory and disk, preventing additional actions while the session information is being stored.
Use the "Write Through" method if information integrity is more important than performance. The action of writing to the disk and memory takes longer, however; the session information is more secure, and less vulnerable to possible hardware failures that may occur and cause information loss.
The "Write Through" method is the recommended method for employing on mission critical applications as session information is immediately written to the disk without any time intervals that could cause loss of information if the Daemon fails. This method should be used for critical session information such as, credit card information or social security numbers. Although, the preferred method for storing mission critical session information is by deploying HA in your environment.
Use the "Delayed Write" method if enhanced performance is high priority. This method writes session information to the memory and only later after X seconds) stores the session information to the disk providing enhanced performance.
The "Delayed Write" method saves session information to the memory and every X seconds flushes the session information to be stored on the disk.
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