Hello Shuwen,

> What functionality of dir "/var/lib/heartbeat/cores/hacluster"?

if a component of heartbeat crashed, the core files are kept in this
directory to do post portem analysis of the problem.

> How to fix this error print? What is your advice?

Fix the permissions. For me the permissions are:

chown <hearbeat user> /var/lib/heartbeat/cores/hacluster

For me on Debian that is:

chown hacluster /var/lib/heartbeat/cores/hacluster

Cheers,
        Thomas
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