Ask HN: server I/O spike
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.
What should I look at when diagnosing what happened?
Weird things at first glance:
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
Comments
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.
Thanks, Any tools to help me along?
Yep, same for me. I've just setup a Linode server today in their London DC.
Sorry, meant to say it happened to me to! Same time and everything.
That's weird, do you think it's related? Maybe a bot like onur said indexing all sites on that ip range?
Check your logs to find out what was going on.
Check your cron jobs too, including those run under non-root accounts.