04-29-2011
Often, the bootstrap is on a simple disk, and the RAID is dedicated to the application. For software RAID, I wonder if that is a requirement, since you need to boot the software to get it together. Remember that raid5 is not churn-friendly or small-block-random efficient, so many shops put high-churn and small block-random data on mirrors, sometimes striped for more bandwidth. Also, the controller(s) can be a bottleneck. Even with lots of RAM, random operations on large data sets will fill RAM uselessly, and fsync() of RDBMS Commit and other critical files (postfix email) waits for magnetic completion. A shot of SSD might be a great complement. Sometimes, you can shadow the SSD with RAID5 hierarchically, so only the most accessed bits move to SSD. Too much modified data in RAM in a liability!
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