Thanks all for your comments.
I will care about as the pdf is ongoing work
My main intention is not to replace ZFS manuals from Solaris or give a full overview but give some basic ideas why and how things work and give my opinion on controversal things like RAM/ ECC/ Slog/ number of disks per vdev and basic configuration ideas regarding snaps and backup.
about RAM
I thought to make it clear that there is no extra RAM need for ZFS over say ntfs.
Oracle claims 2 GB as minimum for Solaris and that is the case for every 64bit OS
But nobody has fun with a 1 -2 GB ZFS filer on such a 64bit system even when stable.
Unless you use fast disks such a server is simply too slow and who would use expensive disks in a low memory setup as they are more expensive that enough RAM.
about Optane
While Optane can be a RAM replacement the main difference of a 900P to Flash is that you can adress data directly like with RAM and not blockwise like with Flash with the need of Trim or erase prior write. Its clear that a 900P is not RAM. Maybe I must clarify this.
There have been some discussions about Optane and Powerloss Protection. Intel guarantees this only for the 4800. When I bought my first 900P this was also in the specs but removed later by Intel.
Now you can speculate if it is removed due marketing or a technical reason. But PLP is not a guaranteed feature on smaller Optane models.
@Patrick
None of the content is really new and for a main site article propably not detailled enough. Intention is more to give some basic recommendations and collect some answers (and opinions) to all the beginners questions or in my opinion wrong statements like min RAM/ECC vs Scrub of Death, Slog vs write cache, golden number of disks in Raid-Z, performance considerations vs pool layout, first steps and similar.
If you are under the impression that parts can be used for guest posts or a series, I am open.