ZFS RAID recommendations: space, performance, and MTTDL all-in

Wrapping up the thread on space, performance, and MTTDL, I thought that you might like to see one graph which would show the entire design space I've been using.  Here it is:

All-in graph 

This shows the data I've previously blogged about in scale. You can easily see that for MTTDL, double parity protection is better than single parity protection which is better than striping (no parity protection). Mirroring is also better than raidz or raidz2 for MTTDL and small, random read iops. I call this the "all-in" slide because, in a sense, it puts everything in one pot.

While this sort of analysis is useful, the problem is that there are more dimensions of the problem. I will show you some of the other models we use to evaluate and model systems in later blogs, but it might not be so easy to show so many useful factors on one graph.  I'll try my best...


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