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Why fencing doesn't work when ring1 name is used in stonith device `pcmk_host_list`/`pcmk_host_map` attribute?

Solution Unverified - Updated 2018-05-24T08:02:04+00:00 -

Issue

Why using only ring1 name in pcmk_host_list doesn't work when trying the fence node and messages similar to following are observed in logs?
```
node1 stonith-ng:   notice: stonith_choose_peer:    Couldn't find anyone to fence (reboot) node2 with any device
```
Can I use the ring1 or any other name for fencing the nodes?

Environment

Red Hat Enterprise Linux 7 with High-Availability or Resilient Storage Add-on
pacemaker cluster with RRP configured

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