On 12/17/2015 04:49 AM, [email protected] wrote: > Hi all, > > I'd like to start discussion on whether the servicegroup in Cinder > is necessary. > > Recently, cinder can only support db driver, and doesn't have > servicegroup concept. > our team wants to implement the servicegroup feature using on > tooz[1] library. Like nova[2], when the state of service is required, > it can be got through servicegroup. > > Besides, due to the cinder-volume-active-active-support[3] merged, > we think it makes the Service Group do more. > > Before the cinder-volume-active-active-support was proposed, Cinder > has no concept of cluster. Therefore, we have a doubt that, if without > cinder-volume-active-active-support, is it necessary to add feature of > servicegroup? > > Any comments or suggestions? > > [1] > https://github.com/openstack/tooz/blob/master/doc/source/tutorial/group_membership.rst > > [2] > https://github.com/openstack/nova-specs/blob/master/specs/liberty/approved/service-group-using-tooz.rst > > [3] > https://github.com/openstack/cinder-specs/blob/master/specs/mitaka/cinder-volume-active-active-support.rst > > > > Best Regards, > Janice
Hi, It will not be possible to use A/A HA configuration of cinder-volume service with LVM driver. According to latest User Survey [1] this driver is running in 22% of deployments. ZooKeeper service groups will be still useful there, as it will allow scheduler to know about failed services/nodes much quicker and prevent from scheduling volumes there. As we have initial Tooz integration [2] already merged for locking purposes, I think that if we'll be able to implement SG in a non-intrusive manner (without changing the default behavior) it would be an interesting option for some deployments. [1] http://www.openstack.org/assets/survey/Public-User-Survey-Report.pdf [2] https://review.openstack.org/#/c/183537/ __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: [email protected]?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
