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# Specifying the I/O properties of a system
The I/O properties of a system can be specified as a YAML string, by
using the option --io-properties, or as a YAML file with the option
--io-properties-file.
The expected format starts with a map of sections at the top level.
Currently only `disks` is supported.
## The disks section
Inside the `disks` section, the user can specify a list of mount points.
For each mount point, 4 properties have to be specified (none are
optional):
* `read_iops`: read IOPS speed of the device
* `read_bandwidth`: read bandwidth speed of the device
* `write_iops`: write IOPS speed of the device
* `write_bandwidth`: write bandwidth speed of the device
Those quantities can be specified in raw form, or followed with a
suffix (k, M, G, or T).
Example:
```
disks:
- mountpoint: /var/lib/some_seastar_app
read_iops: 95000
read_bandwidth: 545M
write_iops: 85000
write_bandwidth: 510M
```
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