Today marked the 18th South Africa ACM ICPC regionals contest. It was an interesting day. We (The judges for the day and myself) prepared a set of 8 problems to be solved by contestants. Read the rest of this entry »
On Friday evening we had a scheduled maintenance power failure in one of our main data-centers. Since we’re running GlusterFS on two servers, replicating between each other, everything is supposed to simply fail over to the other server, and continue on it’s merry way. Everything is configured to be in a redundant configuration. Unfortunately courier-imap seems to be triggering a use-case which GlusterFS cannot properly deal with. Read the rest of this entry »
Recently we’ve had some unexpected bad performance on a few servers that rely on GlusterFS. Specifically our web servers (Apache + PHP portion of our LAMP stack) took quite a beating with more outages than I’d care to admit.
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A couple of years back I discovered that when a VoIP server would sporadically lose it’s registration to the upstream VoIP provider, and then in spite of re-sending those registration requests would seem completely unable to register. Sometimes when rebooting the device it would then manage to reregister but not always. Read the rest of this entry »