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Ive just started to adding ZFS replication support between nas4free boxes.
Ive added also a bandwith limit for the replication ie. replication over WAN and a system that checks differences between zfs snapshots on different machines and determine what kind of snapshot to send full or incremental.
As results are promising, I was wondering if my work can be interesting to the project, and just in case, how to contribute.
Many thanks in advance.

Back to the original topic though, ZFS on Bubba3 would face challenges:

• ZFS ARC is RAM-hungry (deduplication is prohibitive except on the smallest zpools);
• compression, encryption (and to a lesser extent hashing) are CPU-hungry;
• there's not much benefit to ZFS if you don't use ECC RAM
• "single disk ZFS is so pointless it's actually worse than not using ZFS" -- especially if your on-drive cache is not ECC

Thanks for reply I am using btrfs currently, no issues. Just now I'm copying data between 2 btrfs volumes, one SATA and one USB, with avg speed of 23 MBps.