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Throttle disk I/O in Ubuntu 15.04+ / Debian 8 / other distributions with systemd
systemd provides a convenient wrapper around the cgroups kernel feature that allows you to control various cgroups and other properties: http://www.freedesktop.org/software/systemd/man/systemd.resource-control.html
One application of this is throttling disk I/O of a process. Using systemd-run, we can run a command and specify the resource control and other properties:
systemd-run -p 'PropertyName=blah' command to run
Read the man pages:
man systemd-run man systemd.resource-control
In particular, we can use the BlockIOReadBandwidth and BlockIOWriteBandwidth resource control properties to limit the disk bandwidth available to the process. For example, this execution will limit dd to 4MB/s:
systemd-run -p BlockIOReadBandwidth='/dev/vda1 4M' -p BlockIOWriteBandwidth='/dev/vda1 4M' dd if=/dev/zero of=/root/test bs=64k count=16k oflag=dsync
Of course, replace /dev/vda1 with the relevant partition that is mounted (use "findmnt /" if you're not sure).