To take some further wind out, with current disk sizes there’s a decent chance of a second disk failing while you’re still replacing the first. Reading all the

To take some further wind out, with current disk sizes there’s a decent chance of a second disk failing while you’re still replacing the first. Reading all the data off a disk is a stressful operation, you see. But that means you need RAIDZ2 or erasure coding to be reasonably safe, which takes you well outside what most of these turnkey systems can handle.