throttle IO to multiple devices in one group

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Hello,
We are evaluating to use cgroups to isolate different applications on
Linux. One use case of our application is that it reads/writes to
multiple block devices and we would like throttle the IO for each
application to each devices via blkio.throttle.read_iops_device.
However, it looks like each group can only configure one device.

Am I miss anything? Is there a way to support such semantic - limit
the number of reads to multiple devices within one group?

Thanks very much.
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