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I’m just not sure that you can evacuate with the c-vol service for those volume down. Not without the un-safe HA active-active hacks.
In our public cloud, if the c-vol service for a backend/volumes is down, we get woken up in the middle of the night and stay at it until we get c-vol back up. That’s the only way I know of getting access to those volumes that are associated with a c-vol service: get the service back up.

From: Eduard Matei [mailto:eduard.matei at cloudfounders.com]
Sent: Tuesday, September 15, 2015 9:16 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Cinder]Behavior when one cinder-volume service is down

Thanks Scott,
But the question remains: if the "hacks" are not recommended then how can i perform Evacuate when the c-vol service of the volumes i need evacuated is "down", but there are two more controller node with c-vol services running?

Thanks,

Eduard
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