This topic describes performance metrics related to the time consumed by I/O operations in an OceanBase cluster. You can specify a statistical period to query statistics about the time consumed by I/O operations in a single zone or on a single OBServer of an OceanBase cluster.
read
Definition
The average time consumed by each SSStore read in the cluster in the specified statistical period.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| read | io_read_time | Microseconds |
Calculation expression
avg(rate(node_disk_read_time_seconds_total{@LABELS}[@INTERVAL])) by (@GBLABELS) / avg(rate(node_disk_reads_completed_total{@LABELS}[@INTERVAL])) by (@GBLABELS)
write
Definition
The average time consumed by each SSStore write in the cluster in the specified statistical period.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| write | io_write_time | Microseconds |
Calculation expression
avg(rate(node_disk_write_time_seconds_total{@LABELS}[@INTERVAL])) by (@GBLABELS) / avg(rate(node_disk_writes_completed_total{@LABELS}[@INTERVAL])) by (@GBLABELS)
