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Taikun OCP Guide

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Increase Block Storage API service throughput

By default, the Block Storage API service runs in one process. This
limits the number of API requests that the Block Storage service can
process at any given time. In a production environment, you should
increase the Block Storage API throughput by allowing the Block Storage
API service to run in as many processes as the machine capacity
allows.

Note

The Block Storage API service is named
openstack-cinder-api on the following distributions:
CentOS, Fedora, openSUSE, Red Hat Enterprise Linux, and SUSE Linux
Enterprise. In Ubuntu and Debian distributions, the Block Storage API
service is named cinder-api.

To do so, use the Block Storage API service option
osapi_volume_workers. This option allows you to specify the
number of API service workers (or OS processes) to launch for the Block
Storage API service.

To configure this option, open the
/etc/cinder/cinder.conf configuration file and set the
osapi_volume_workers configuration key to the number of CPU
cores/threads on a machine.

On distributions that include openstack-config, you can
configure this by running the following command instead:

# openstack-config --set /etc/cinder/cinder.conf \
  DEFAULT osapi_volume_workers CORES

Replace CORES with the number of CPU cores/threads on a
machine.

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