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Note!

Sometimes, you may notice that file storage takes up more space than expected. This is expected behavior. Read through this note for an overall understanding of the way file storage in Aggregation works. 

When session data is stored, it is appended to the session file. This means that old session data from the session file is still present in the storage and the current version is added to the file. Removal of old data is done only under certain conditions because otherwise, aggregation handling would be too slow. This is why file storage takes up more space than calculated with session number and single session object size.

The session files on the disk grow up to a certain threshold ( 50MB by default) and then a new file is created and used. The old session file will be deleted when no more active sessions are stored in it. The accepted size of a session file can be adjusted by using using the aggregation.min_session_file_size parametersize property. For instance, 

For example:

aggregation.min_session_file_size=20000000 will 20000000 

will set it to 20MB.

This property can be configured in the ECD.v

Old files are removed during the storage commit. Also, since there is a possibility that there will be old session files present because of some long-lived sessions stored there, a defragmentation algorithm is implemented. It runs occasionally and moves those long-lived sessions to new session files so that old session files can be deleted.

This is why aggregation storage takes up a lot of disk space. It is designed to provide higher performance at the expense of higher disk space consumption.