I have an app on linode and they sent me an email letting me know of a spike in disk I/o that lasted about 2 hour ad now it's back to normal.<p>What should I look at when diagnosing what happened?<p>Weird things at first glance:<p>1) A spike of incoming network traffic happened at 22:00
2) A spike of outgoing network traffic between 2:00 to 4:00
3)Disk I/O between 6:00 and 8:00
You can check the access logs of your server. Probably this is caused by a bot crawling your site and you will see the same IP over and over there. But I'm totally assuming you have a site hosted there which has some kind of database dependence and lots of pages to crawl.