What exactly does "large file transfer" mean? Are you using NFS, CIFS, FTP? What is the client application? Additionally, listing the output of the zpool status command would be really useful.
It's certainly not a limitation of the onboard storage controller because you've shown that you can do 125 MB/s on a RAID0. The controller doesn't have to do any extra processing with ZFS, the RAID calculations all happen in software.
As for LAGG (assuming that you're referring to link aggregation via the lagg(4) module) which mode did you use? Generally speaking link aggregation doesn't help in single-server single-client configurations because each connection will only go over a single leg of the aggregate.
It's certainly not a limitation of the onboard storage controller because you've shown that you can do 125 MB/s on a RAID0. The controller doesn't have to do any extra processing with ZFS, the RAID calculations all happen in software.
As for LAGG (assuming that you're referring to link aggregation via the lagg(4) module) which mode did you use? Generally speaking link aggregation doesn't help in single-server single-client configurations because each connection will only go over a single leg of the aggregate.
