ICPSR's content delivery system showed very high availability in March 2013: a bit over 99.95% uptime. We had only two problems in March. One was a power outage that affected our headquarters on the University of Michigan campus, and we experienced a small amount of downtime as we moved service to our replica in Amazon's cloud. The second was a 21-minute outage due to a continuing -- but now solved, we think -- problem with exporting content from our Oracle database server.
Here are the overall numbers for ICPSR's 2012-2013 fiscal year:
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We replaced our aging Oracle database server with a new machine which has twice the memory, twice the computing power, and perhaps most impressively, has 300 times the disk I/O speed(!). The new machine has an array of solid-state drives (SSDs), and we use this for all of our database storage. (The operating system resides on conventional disk drive technology.)
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