database system identifier differs between the primary and standby?

[tvb]

What does this mean?

FATAL:  database system identifier differs between the primary and standby
DETAIL:  The primary's identifier is 6150202608832133854, the standby's identifier is 6150207001805245765.

[Winslett]

This should never happen unless you are running different clusters trying to talk to each other. For example, you initialize clusters A and B separately. Then, you try to attach a follower from cluster B to cluster A.

This could happen in Governor if you have two clusters sharing a namespace.

[tvb]

Hmmm well I have not seen it again since I reinstalled the cluster. So lets not spent anymore time on this.