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The Curious Case of the Failing Connections, Part 2

Sep 15, 2009, 21:02 (2 Talkback[s])
(Other stories by Jeremy Zawodny)

"Recap
As you may recall from last week, we were starting to troubleshoot is strange problem with failing or dropped connections between our Sphinx servers and MySQL slaves. We were in the midst of suspecting the network and pick up the story there.

"The Suspects
At this point I should note that we weren’t really running any production services at this new data center. This was all part of the process of getting it ready to do so. It wasn’t that unreasonable to think that something might be misconfigured. And, again, even though it tested well, we were also essentially on a new hardware platform and a new operating system release.

"We tried moving servers around on the network: move one MySQL box and one Sphinx box from this set of ports to that set of ports to see if it’s a bad linecard in our switch. No dice. The problem was still there. We measured network performance between the hosts and things seemed okay there too."

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