@scottalanmiller said in Email server options:
Sort of, but that's not quite the same. It's distributed in both cases, it is redundant in both cases. There are lots and lots of factors involved, not just "breaking it up into nodes." It's more complex than that. At some point, more smaller spindles is safer, but at some point fewer, larger ones are.
At what point fewer larger spindles are safer? With more drives you get more spindles, reducing the seek time, the main problem with magnetic drives. With more drives you can implement RAID with better redundancy levels - 10, 50, the EE variants etc. The only real downside is the fact that you are running more kit - you need more physical space, connectors, cables, power and more parts might fail and need replacements (without affecting the system).
And you have to consider a lot of factors including drive fail rates, UREs, time to rebuild, time to replace, etc. It's a large equation.
Most of these factors, when dealing with spindles and not SSDs/NVMes favour the more/smaller idea.
For example, if your drives move 100 IOPS, then many small drives is likely to make sense. But if your drives move 10,000,000 IOPS, then two giant drives will likely make more sense (assuming equal failure risks.) Speed and failure rates are key here, if you don't consider then, you can't tell when more drives or fewer drives is safer.
10000000 IOPS? Are we still talking about spindles here?