Volume Specifications
In OpenStack, “volumes” are persistent storage that you can attach to your running OpenStack Compute instances to. In openstack we have set up three classes of service for volumes. These have different limits, which are detailed below.
Volume Types
We have three main volume types:
- high-iops
- standard
Volume Type List
An overview of the three volume types below:
| Name | Read Bytes Sec | Read IOPS Sec | Write Bytes Sec | Write IOPS Sec |
|---|---|---|---|---|
| high-iops | 524288000 | 10000 | 524288000 | 10000 |
| standard | 209715200 | 2500 | 209715200 | 2500 |
Choosing a Volume Type
You can select one of the three volume types upon creation of a volume with the following command (Unless otherwise specified, the type “default” is always used): $ openstack volume create <volume-name> --size 10 --type high-iops
Changing the Volume Type
You can adjust the selected type of a volume. To do so, you can use the “Change Volume Type” function in the dashboard. Alternatively, you can change the type via the CLI with the following command: $ openstack volume set <volume-name> --type high-iops However, changing the volume type is only possible if the volume is not currently in use by an instance.