Disk writes every 15 minutes?

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http://serverfault.com – Just trying to get to the bottom of this. I run a Web app on a LAMP stack on Amazon EC2. Typically the server is writing about 2.5MB/min to the hard drives. It looks like the apache log file and the amount actually written rises and falls precisely in the same shape as my network in/out graphs. The database is read only and the only writes to hard drive should be logs. But precisely every 15 minutes the server also does a 12-15MB write to the hard drive - I do not know what this could be. The only clue is that it too follows the shape of my network in/out graph, only more exaggerated. T (HowTos)