This topic describes performance metrics related to the I/O throughput of a host.
Background information
Host monitoring supports the monitoring of input/output operations per second (IOPS) on multiple mounted disks. If a host is mounted with multiple disks, multiple pairs of read and write metrics, such as sda: io_read and sda: io_write and sdb: io_read and sdb: io_write, are displayed.
The metric field names and calculation expressions of the metric pairs are the same.
read
Definition
The average amount of data read from the disk per second.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| read | io_read_byte | Megabytes |
Calculation expression
avg(rate(node_disk_read_bytes_total{@LABELS}[@INTERVAL])) by (@GBLABELS) / 1048576
write
Definition
The average amount of data written to the disk per second.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| write | io_write_byte | Megabytes |
Calculation expression
avg(rate(node_disk_written_bytes_total{@LABELS}[@INTERVAL])) by (@GBLABELS) / 1048576
