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Hello,

there is additional issue, then using active/active cinder volume setup:

https://bugs.launchpad.net/cinder/+bug/1927186

as we discussed in cinder IRC - it looks like architectural problem in cinder (data sync between active/active cinder-volume and cinder-scheduler)

Regards,

Ilya


________________________________
From: Eugen Block <eblock at nde.ag>
Sent: Monday, August 28, 2023 11:06 AM
To: openstack-discuss at lists.openstack.org <openstack-discuss at lists.openstack.org>
Subject: Re: [cinder][kolla-ansible] cinder-volume active/active usage

Hi,

I'm not familiar with kolla-ansible but since nobody else replied to
this thread I just wanted to bump it. A year ago Gorka commented on my
thread [3] about active/active setup, but we don't use any of the
deployment tools, we have our own deployment method. I also don't
really have answers for you, I don't think it makes a big difference
which DLM tool you use, maybe the one you're more familiar with. I
tested cinder-volume a/a with zookeeper and seemed to work well in my
lab setup, I don't have an actual deployment to speak from experience.

Regards,
Eugen

[3]
https://lists.openstack.org/pipermail/openstack-discuss/2022-September/030554.html

Zitat von 韩光宇 <hanguangyu2 at gmail.com>:

> Hello,
>
> I saw that kolla-ansible had allow cinder coordination backend to be
> configured. And it can be set to "redis" or "etcd" in
> /etc/kolla/gloabls.yml [1]. Based on my current understanding, this
> option enables cinder-volume active/active.
>
> 1. I would like to ask, between Redis and Etcd, which one is more
> recommended or what are their pros and cons?
> 2. And I have saw the spec of cinder-volume a/a[2]. Is it sufficient
> to configure [coordination]backend_url and [DEFAULT]cluster to use
> Cinder volume active/active, or are there any other considerations?
> Could any reference for Cinder volume active/active configuration and
> usage documentation be recommended ?
>
> I would appreciate for any help.
> Best wishes.
>
> Han Guangyu
>
> [1]
> https://github.com/openstack/kolla-ansible/blob/master/etc/kolla/globals.yml#L539
> [2]
> https://specs.openstack.org/openstack/cinder-specs/specs/ocata/ha-aa-job-distribution.html




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