Re: PG Upgrade with hardlinks, when to start/stop master and replicas

Bruce Momjian <bruce@momjian.us> writes:
> On Thu, Feb 21, 2019 at 09:31:32PM -0500, Stephen Frost wrote:
>> * Bruce Momjian (bruce@momjian.us) wrote:
>>> There was too much concern that users would accidentally start the old
>>> server at some later point, and its files would be hard linked to the
>>> new live server, leading to disaster.

>> Sure, I understand that concern, just wish there was a better approach
>> we could use for "DO NOT START THIS SERVER" rather than moving of the
>> pg_control file.

> As ugly as it is, I have never heard of a better solution.

system("rm -rf $OLDPGDATA") ... nah, that is not a better idea.

                        regards, tom lane