Comment by jakedata

Happy to see the ARC bypass for NVMe performance. ZFS really fails to exploit NVMe's potential. Online expansion might be interesting. I tried to use ZFS for some very busy databases and ended up getting bitten badly by the fragmentation bug. The only way to restore performance appears to be copying the data off the volume, nuking it and then copying it back. Now -perhaps- if I expand the zpool then I might be able to reduce fragmentation by copying the tablespace on the same volume.