Is there any news on what the performance of ZFS will be like on SCALE vs CORE? Reason is I have a 6-disk ZFS array (stipe of mirror'ed vdevs) dedicated as a Nakivo backup box. I was running on the latest TrueNAS and was very happy as virtual machine "screenshot verification" and "flash VM boot" all worked (Nakivo features). Unfortunately Nakivo only have a partial product solution for TrueNAS as they support VM backups on TrueNAS, but not Office365 backups, as it won't let you create a "SaaS" repository. Bummer.
So I rebuilt the box as Ubuntu Linux Server 18.04 (Nakivo don't currently support 20.04), and installed ZFS. Setup the array exactly the same with my stripe of mirror vdevs, ashift=12 for my 8TB 4k/512e drives, and perfomance is woeful. Screenshot verifcations and flash VM boot doesn't work, even with tweaking everything I can with turning off atime, zero compression (software does compression and the LZ4 gets me next to nothing here), and some other tweaks. But ZFS on Ubuntu just doesn't cut it for me for running Nakivo. Granted ZFS is not a supported filesystem for Nakivo on Ubuntu, but I tried anyway.
So now I plan to install SCALE (testing the new beta... non production!), and then put Nakivo in an Ubuntu 18.04 KVM, and mount ZFS storage into Nakivo using NFS for VM backups, and iSCSI for a block-device SaaS repository. If performance isn't great with this, I'll try a similar setup on CORE (with a bhyve VM, plus NFS and iSCSI).
Long story short - how does ZFS performance on SCALE compare to CORE? I'm very wary of ZFS on Linux now after being scarred by my Ubuntu 18.04 experience with poor performance. No bugs but just stuff is noticeably slooooower. THANKS!!