I looked into this a while ago. It seems the best you can do is to try to look the most “average”. All attempts to obfuscate details other than “average” make you stand out even worse.

I used it for a few months. Mostly with snikket. It worked fine for Android but I had problems getting notified on an iphone.

Those failure rates are nonsense based on theoretical limits. In practice: a few weeks ago I resilvered a 4 disk z1 array with 8tb disks at 85% capacity in less than 24 hours. I scrub the pool every month and it didn’t seem any more taxing than a scrub.