1.7.5 Monitoring disk resources
This subsection explains how to monitor the disk resources of a Docker container.
- Organization of this subsection
(1) Overview
For Docker containers, the disk I/O resource, which includes information such as the disk transfer rate, can be monitored. The PI_HPDI and PI_HLDI records that indicate the physical server's disk resource and the PI_VLDI record that indicates the virtual machine's disk space resource are not supported.
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PI_VPDI record
This record is used to monitor the performance data of the disk device that is used by a Docker container. It shows the disk I/O resource as viewed from the Docker container.
(2) Monitoring examples
This subsection uses an example of monitoring the Docker container's disk I/O to explain the problems that might occur in disk resources and how to solve them. The following figure shows the items monitored here and the flow of actions to take.
(a) Example of monitoring the disk I/O volume of a container
You can check the value of disk I/O volume in the Speed field of the PI_VPDI record. The figure below shows a monitoring example.
- Monitoring template report to be checked
In this example, the value of disk I/O volume for container1 has increased. You can solve this problem by identifying a Docker container with high disk I/O volume.