currently that I know of there is not a way to do that. I had a customer that wanted some information about this subject and the only solutions we found were from IBM and Syncsort.
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hello, currently Splunk does not have a way to natively inject mainframe logs, there is alot of good information on a product called Ironstream from Syncsort.
http://www.splunk.com/view/splunk-and-syncsort-alliance-delivers-machine-data-insights-from-mainframes/SP-CAAAM4C
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