Hi. This is somewhat little brief, but I'm not sure what more to add. Feel free to expand :-) RCTL disk IO limits Edward Tomasz Napierala trasz@FreeBSD.org

An important missing piece of the RCTL resource limits mechanism was the ability to limit disk throughput. This project aims to fill that hole by making it possible to add RCTL rules for read BPS, write BPS, read IOPS, and write IOPS. It also adds a new throttling mechanism, to delay the process execution when a limit gets hit.

The project is at late implementation stage. The major piece of work left, apart from testing, is to integrate it with ZFS. The project is expected to ship with FreeBSD 11.0.

The FreeBSD Foundation