September was an OK, but not great month for web availability:
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We eliminated one frequent, but short-lived source of downtime when we stopped exporting the content of our Oracle database nightly. We are now doing it only on the weekend, and while that adds some risk, we're gaining significant uptime. (For some reason that we do not understand, our Oracle instance stops answering queries for 15-20 minutes about ten minutes AFTER the export completes.) We have a new server racked and ready to install, and we're hoping that a fast new machine with solid-state drives will solve the problem for us.
We did run into some trouble mid-month when some routine maintenance went awry, and we had to fail over to our replica over the weekend of September 15 and 16. The total amount of downtime was about 90 minutes total over the course of the weekend, but the replica kept the problem from clobbering our service completely.
After that we had pretty smooth sailing for the rest of the month. Just 16 minutes of downtime for the rest of the month.
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