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Asked: 2015-01-24 13:25:40 +0800 CST

cgroups disk IO throttling with zfs

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I'd like to use cgroups with my linux containers to throttle disk IO on them. Containers placed on ZFS volume /tank/lxc. I have three containers each in their own /tank/lxc/nodeXX directory.

How can I throttle IO for a container?

Are there minor:major block numbers for ZFS volume/Zpool, how can I find them?

lxc

1 Answers

  1. It should work, didn't tested it yet.

    echo 500  > /sys/fs/cgroup/blkio/lxc/node01/blkio.weight
echo 100  > /sys/fs/cgroup/blkio/lxc/node02/blkio.weight
echo 1000 > /sys/fs/cgroup/blkio/lxc/node04/blkio.weight

    lxc containers must be up and running, cgroup must be installed. Regarding to this answer, cfq disk IO scheduler must be configured for cgroups in order to be able to throttle the IO. To configure cfq for ZFS:

    echo cfq > /sys/module/zfs/parameters/zfs_vdev_scheduler

    To make this parameters persistent, copy the commands to /etc/rc.local

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