As I mentioned in my other[1] post, the SLOG isn't really a write-back cache. My workloads are mostly async, so SLOG wouldn't help unless I force sync=always which isn't great either.

I love ZFS overall, it's been rock solid for me in the almost 15 years I've used it. This is just that one area where I feel could do with some improvements.

[1]: https://news.ycombinator.com/item?id=41670945