Why the 2^n + p rule is broken
If we take the example of a 10 drives RAID-Z2, who follows the 2^n + p rule, we have a 5 % overhead (32 + 8 = 40 sectors --> 40 / 3 = 13.333 so we need a 2 sectors padding) so the rule is obviously broken. Now we can't do anything about that, this rule is just a (over) simplification so it's not exact.
You gotta love all the math brought into this topic.
Figuring out space lost in ZFS due to RAIDZ allowing for compression efficiency:
I would have loved to but I'm afraid I'm too busy. I'm about to start painting my submarine and then I have to vacuum clean my duck: https://youtu.be/-n8fn7k9NiEFeel free to correct it.
I believe I am qualified to say this image is pure gibberish.Figuring out space lost in ZFS due to RAIDZ allowing for compression efficiency:
I believe I am qualified to say this image is pure gibberish.
I believe that was implicit. ;)As are the calculations required to determine the space lost in ZFS...