This topic describes the performance metrics related to the input/output operations per second (IOPS) on a host. IOPS refers to the number of read and write operations performed per second on the disk.
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 number of disk reads per second.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| read | io_read | count |
Calculation expression
avg(rate(node_disk_reads_completed_total{@LABELS}[@INTERVAL])) by (@GBLABELS)
write
Definition
The number of disk writes per second.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| write | io_write | count |
Calculation expression
avg(rate(node_disk_writes_completed_total{@LABELS}[@INTERVAL])) by (@GBLABELS)
