RATE: 函数，(当前采集值 - 上一个采集值) / 采集时间差
Name
- docker.io.write_bytes
- bytes/second
- Bytes written per second to disk by the processes of the container
- docker.io.read_bytes
- bytes/second
- Bytes read per second from disk by the processes of the container
计算公式
io_read = blkio.throttle.io_service_bytes文件中所有包含Read行的累计值
io_write = blkio.throttle.io_service_bytes文件中所有包含Write行的累计值
docker.io.write_bytes ＝ RATE(io_write)
docker.io.read_bytes = RATE(io_read)
文件位置
容器对应的blkio.throttle.io_service_bytes文件可能在如下三个目录中：
- /sys/fs/cgroup/blkio/docker/<container_id>/
- /sys/fs/cgroup/blkio/kubepods/burstable/<pod_id>/<container_id>/
- /sys/fs/cgroup/blkio/kubepods/besteffort/<pod_id>/<container_id>/
blkio.throttle.io_service_bytes文件示例内容如下：
cat blkio.throttle.io_service_bytes
7:0 Read 246784
7:0 Write 209481728
7:0 Sync 0
7:0 Async 209728512
7:0 Total 209728512
253:0 Read 246784
253:0 Write 209481728
253:0 Sync 0
253:0 Async 209728512
253:0 Total 209728512
253:2 Read 99832832
253:2 Write 267956224
253:2 Sync 58458112
253:2 Async 309330944
253:2 Total 367789056
Total 787246080
