As you can see from the picture http://i.imgur.com/UpDZh.png), my server is suffering a serious drop in speed. This is intermittent and has been happening for the past 3 or 4 hours. The server has 1gbps uplink so I can't figure out why it's happening. Checking bandwidth monitoring tools like bwm-ng and dstat show normal speeds of like 150kb/s outbound traffic.
Is there a tool like iotop but for monitoring IO on specific volumes? (Or perhaps I missed a way to filter iotop?) If not is there any way to get at this information via (say)/proc? (dstat etc. only show aggregate activity across all processes per volume, whereas I'm interested in seeing how much each process is contributing.) Thanks.
How do I tell how much load a particular process is contributing to each of several available volumes/mounts? Seems that dstat only shows aggregate stats across all processes per disk, and iotop only shows aggregates stats across all disks per process. Thanks.