rpk iotune
rpk iotune measures the I/O performance of the hardware used by a Redpanda instance and writes its parameters to an I/O configuration file that Redpanda reads on startup to optimize its I/O performance. Its benchmarks measure read/write IOPS and bandwidth.
By default rpk iotune writes its output parameters to /etc/redpanda/io-config.yaml.
Usage
rpk iotune [flags]
Flags
| Value | Type | Description |
| --config | string | Redpanda config file, if not set the file will be searched for in the default locations. |
| --directories | strings | List of directories to evaluate. |
| --duration | duration | Duration of tests.The value passed is a sequence of decimal numbers, each with optional fraction and a unit suffix, such as 300ms, 1.5s or 2h45m. Valid time units are ns, us (or µs), ms, s, m, h (default 10m0s). |
| -h, --help | - | Help for iotune |
| --no-confirm | - | Disable confirmation prompt if the iotune file already exists |
| --timeout | duration | The maximum time after -- to wait for iotune to complete. The value passed is a sequence of decimal numbers, each with optional fraction and a unit suffix, such as 300ms, 1.5s or 2h45m. Valid time units are ns, us (or µs), ms, s, m, h (default 1h0m0s). |
| -v, --verbose | - | Enable verbose logging (default false). |
Example output
Running rpk iotune produces an output file that by default is saved in /etc/redpanda/io-config.yaml.
The contents of an example io-config.yaml:
disks:
- mountpoint: /var/lib/redpanda/data
read_iops: 40952
read_bandwidth: 5638210048
write_iops: 6685
write_bandwidth: 1491679488