>> I have the following scenario that I am trying to simulate. >> >> I have a volume replicated between clusters A and B, primary on cluster A. >> The volume is attached to and mounted on a VM instance VM1 on cluster A. >> I take a snapshot of VM1. >> I now imagine that VM1 on cluster A becomes unreachable, so I want to >> bring up VM1 on cluster B, and attach to it the replicated volume. >> I have to make the volume primary on cluster B. >> As long as the volume is primary on cluster A, I cannot make it primary on >> cluster B. >> >> I want to force the transition of the volume on cluster B from secondary >> to primary, without having to perform operations on cluster A. >> >> What is the proper sequence of operations / commands to accomplish this? >As in your expected experiment, you will need to cut the communication path >between the two sites.
>The easiest way to do so is to run "drbdadm disconnect <resource>" on one >of the sites; given your requirements, on cluster B. This changes the state of the volume on cluster B to "OutDated" and I am unable to change the volume to primary. I seem to still be missing something. I tried to do --force to make the volume primary, but then I was unable to import it to (OpenStack) cinder and attach it to an instance, since the id was not recognized. - Kalman
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