Posted by: Anonymous
[ip: 124.148.98.155]
on April 10, 2008 02:33 AM
For RAID-5, if you have a bit of RAM to throw at the disk subsystem then you also get to avoid so many reads before writes. If you're using multicore CPU then the parity calculation shouldn't really hit to too much. And if you invest in a UPS then you can play games with RAM tradeoffs to writes too, because you know that the machine isn't going to disappear in the next 30 seconds. So yes, RAID-5 is always going to be a more involved and demanding RAID than a mirror set, but it's not like write performance is bound to doom you with R-5.
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Inspecting disk IO performance with fio
Posted by: Anonymous [ip: 124.148.98.155] on April 10, 2008 02:33 AM#