Am I right in saying you can still mix and match drives in RAID-Z1 (with FreeNAS) and that if I put 2x 1.5TB and 2x 2TB in an array I'd get roughly 4.5TB back with a fault tolerance of 1 disk?
Think I might go for Z2, so sacrifice some space and gain protection. Haven't decided yet! Space or more protection... hmmmm. I will be backing the whole lot up to a big external drive so maybe Z1 is the way to go.
That's true, it's unlikely that I'll get a complete failure with Z1 and if I did then the most I'd lose is a day or so. Even then, I have CrashPlan for my documents, etc. so wouldn't lose anything major.
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