zfs capacity

[Gerrit Kühn]

Am Fri, 18 Oct 2019 11:35:54 +0200
schrieb Gerrit Kühn <gerrit.kuehn at aei.mpg.de>:

Hi,

> I just tried these two raidz2 setups with 36 disks: 3x 10+2, 4x 7+2.
> The result is a bit puzzling for me, because I get the same capacity,
> although one setup is using 6 drives for redundancy, the other is using
> 8:

For the record:
I found this to be caused by allocation padding (and I was most irritated
by the fact that in the case I tested it turned out to yield /exactly/ the
same number of usable space regardless of having two more data disks).
Anyway, I found this table very helpful, so I'd like to share the link
(even if this may be well-known to others already, it took me some time to
find it):
<https://docs.google.com/spreadsheets/d/1pdu_X2tR4ztF6_HLtJ-Dc4ZcwUdt6fkCjpnXxAEFlyA/edit#gid=804965548>


cu
  Gerrit