Propably a new Open-ZFS patch can help in future
that may double write performance on fast devices?
fio w/12x zvols prior to changes:
Run status group 0 (all jobs):
WRITE: bw=1267MiB/s (1328MB/s), 1267MiB/s-1267MiB/s (1328MB/s-1328MB/s), io=148GiB (159GB), run=120009-120009msec
fio with changes applied:
Run status group 0 (all jobs):
WRITE: bw=2380MiB/s (2495MB/s), 2380MiB/s-2380MiB/s (2495MB/s-2495MB/s), io=279GiB (299GB), run=120007-120007msec
zfs sync parallelism by ednadolski-ix · Pull Request #15197 · openzfs/zfs