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-d /proc? That will never give anything afaict, because/procis not a device. You'd want to run it without that to see all devices, i.e.iostat -x. Heck, even the-xcan be left out if you're not looking for obscure stats like "aqu-sz". Other than that, though, this is the tool I was looking for. It doesn't do by process, but I have one process reading from multiple disks and dominating my iotop stats, so I can estimate how much data is read from each device. Thanks!