This enhancement provides the option to use a log stream as an alternative to the in-memory data store, therefore removing the 2 GB limit, as described in the KBA for SDF21D0.
The use of a log stream allows for the temporary storage of data in much greater quantities than the default in-memory data store. An in-memory data store is limited to two gigabytes; whereas, a log stream data store will allow you to define a much larger data store to suit your mainframe environment. A log stream also retains data that has been collected, but which has not been sent, in case Ironstream, or the system itself, terminates for some reason.
For more information, refer to the “Manually Setting Ironstream Parameters” chapter in the Ironstream Configuration and User’s Guide.