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Unfortunately, IAG does not currently support running on a read-only file system. It is true that time could be spent to work out where it needs to write files, and then you could individually mount these directories as volumes, but this would not be reliable because it is not officially supported – and the developers are at liberty to change these directories at any time. I would suggest that if you need this capability that you raise an 'Idea' against the product.
Thanks.
Scott A. Exton Senior Software Engineer Chief Programmer - IBM Security Verify Access IBM Master Inventor