Hi,
Are there known limitations with the blkio cgroup controller when used with LVM?
I'm using Ubuntu 15.10 with the 4.2 kernel. I got the same results with CentOS 7.
I set up two groups, /sys/fs/cgroup/blkio/test1 and /sys/fs/cgroup/blkio/test2.
I set the weight for test1 to 500, and the weight for test2 to 1000.
If I then read/write to a file on /dev/sda1 from a process in each group, then
everything works as expected and test1 gets half the bandwidth of test2.
If I do the same but accessing an LVM logical volume, where the underlying
physical volume is /dev/sda4, then both groups get the same bandwidth.
It appears that the group weight doesn't get propagated down through all the
layers. Am I missing something? If not, is this documented anywhere?
Thanks,
Chris
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