Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 01/02/16 09:37 AM, Kalman Meth wrote: > 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? > > Thank you, > > - Kalman > > Kalman Z. Meth, PhD. > Cloud Platforms > IBM Haifa Research Lab > Haifa University Campus, Mount Carmel, > Haifa, 31905, Israel > e-mail: meth at il.ibm.com, Tel: +972 4 829 6341, Fax: +972 4 829 6114 Fencing handles this. Node 2 loses contact with node 1, times out, asks the cluster to fence node 1. When fencing succeeds, Node 2 knows the state of node 1 (off) and can safely promote itself without causing a split-brain and recovery can proceed. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?