I/O limits

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The I/O limit feature is available in OpenVZ since kernel 2.6.32-042stab084.3 and vzctl 4.6. This feature allows to limit disk I/O bandwidth available to a container.


root@host# vzctl set 777 --iolimit 3M --save
Setting iolimit: 3145728 bytes/sec
CT configuration saved to /etc/vz/conf/777.conf
root@host# vzctl enter 777
root@CT:/# cat /dev/urandom | pv -c - >/bigfile3
39.1MB 0:00:10 [   3MB/s] [         <=>     ]


Limit works for reading and writing. There is also a burstable limit which allows 3x normal limit for a very short time.

See also[edit]