Is the caching bagged? Oo You are suppose to and encouraged to have as much ram as your server/wallet will allow you to have.
Also don't buy the whole "you must use ECC ram with zfs or else". I read thru that entire chain, and one of the ex-Sun devs who made ZFS explained that concerns were unfound.*
If caching is bugged than this is an argument against running ZoL
I know its a long shot, but have you, perhaps considered... UNIX? = p I am obviously unsure if the userland you need will be there(since you have not specified what is it you need), but mayhaps its worth a look? Dragonfly & Free BSDs may have everything you are looking for.
Alternatively alternatively why not give SmartOS a chance? Its free, it is UNIX but... It has first class KVM, and essentially allows you to run linux binaries almost on bear metal! Its free forever (as every true UNIX should be! ^^) and all you would need to do is spin up instances of ubuntu server (as many as you need!) inside zones and vuala, you got Linux binaries interacting almost directly with ZFS. ZFS will protect you from any data issues, and KVM will illuminate the hustle of maintenance. Server carped out? Roll it back in time! etc. etc. Oh and zones will make you very resistant to outside forces that would want to steal your stuff ^^ IMO, this might be the best of all worlds as this way you get to use all the stuff you like about linux without dealing with its shortcomings?Oo
Additionally I highly recommend multiple small driver as oppose to big chunks. If you are looking for say 6Tbs, I'd go 4x2Tbs in RAID-Z1. Resilver times can become a nasty pain.
Also make sure your drives are smartd compatible as ZFS doesn't monitor the health of the drive, it watches for data. Smartd keeps an eye on your drive and gives you warnings if things are about to go south. WD drives are smartd compatible, I never checked others but I am sure only a minority is not compliant.
Also, an extra 40gig SSD for 20 bucks does not hurt as a logging device. IMO a great addition to any home ZFS.
"Matthew Ahrens, one of the cofounders of ZFS at Sun Microsystems and current ZFS developer at Delphix. In the comments to one of my filesystem articles on Ars Technica, Matthew said “There’s nothing special about ZFS that requires/encourages the use of ECC RAM more so than any other filesystem."Edited by _Red_Dog_ - 7/1/16 at 11:03am