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https://docs.linbit.com/doc/users-guide-84/s-resolve-split-brain/

stop cluster, on broken node first!

sudo pcs cluster standby jtel-2-5-pn-1
sudo pcs cluster standby jtel-1-5-pn-1

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sudo pcs cluster unstandby jtel-1-5-pn-1
sudo pcs cluster unstandby jtel-2-5-pn-1

check cluster

sudo pcs resource show

check DRBD

sudo cat /proc/drbd