Um, I don't know how I really feel about it. Reiser was mediocre file system to begin with, XFS was much better in every possible use case, and still is. If anything, they should rename the damn thing, having a name after murderer is never a good thing.
ReiserFS was really great at handling massive numbers of tiny files. That was its strong suit. It was good enough that Suse used it by default.
Thanks - I will proceed without using ZFS - I prefer hardware RAID.
ZFS is perfectly fine with hardware RAID, if you like ZFS' features otherwise (like zsend is nice) then there's no reason to avoid it. If you don't plan to use any unique features, then XFS is my "go to" choice by default. Very fast, very stable.
I would recommend looking at StarWind SA for example.
That solution fits your requirements perfectly, it will also provide you with HA storage that will ensure the business continuity.
As for support, they offer a single point of contact no matter what issue you face, plus the system will be shipped to your site fully preconfigured and pretested.