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On 09/07, Swapnil Kulkarni wrote:
> Hello Cinder Team,
>
> Can someone provide a reference documentation for active/active support for
> a Cinder Driver w.r.t. configuration and any driver changes expected?
>
> Best Regards,
> Swapnil

Hi,

You can check support for a specific driver on the driver support matrix
page [1].

As far as I know the configuration is not spelled out in the docs, so it
will depend on the deployment tool you use.

Basically there are 3 parts:

- DLM deployment: It is necessary to deploy an external service to be
  used as the Distributed Lock Manager. This service must be supported
  by the TooZ library.

- Cinder configuration: Make sure that the "host"/"backend_host"
  configuration option is unique for each cinder service, define a name
  for the cluster in the "cluster" option, configure the "backend_url"
  in the "[coordination]" section.

- Configure the HA cluster resource manager for an Active-Active
  cinder-volume service.

Cheers,
Gorka.

[1]: https://docs.openstack.org/cinder/latest/reference/support-matrix.html#operation_active_active_ha