Sumo Logic, a Mountain View, Calif.-based log management startup, has secured a $30 million Series C funding round from Accel Partners along with existing investors Greylock Partners and Sutter Hill Ventures. The company, which competes primarily with Wall Street darling Splunk (s splk), has now raised $50.5 million since its creation in 2010 and its public launch in January 2012. Sumo Logic is on