using R19 with the latest nightly build or Ornatrix and rendering with RS. Facing a problem here with the basics. Maybe I just don't get how it works but I am using a rendercount of for example 500000 and a count fraction of 5%. I expected it to show 5% of the 500000 in my viewport and show all of the 500000 hairstrands when I hit render but it show the exact same amount not matter what I am doing. Tried to render within the renderview of RS as well as with the traditional picture viewer. Am I missing something or is this a bug?
That's how Redshift works. The IPR mode will render whatever is on the viewport. To render all the hairs you have to run a bucket render or increase the viewport count to 100%.
I wasn't able to reproduce this issue on hair generated from guides but the team did some fixes that should solve this issue as well. Please try the latest nightly build when it's available.