Can PAF be used to provide zero downtime while primary and backup servers are being patched?

From: David Gauthier <davegauthierpg(at)gmail(dot)com>
To: Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: Can PAF be used to provide zero downtime while primary and backup servers are being patched?
Date: 2020-08-06 14:01:21
Message-ID: CAMBRECAWf8z-3Na+ucR1EsAPWYCrUU4K_-u73_BbAV7YSbeGJA@mail.gmail.com
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Our IT dept needs to install a patch on both primary and backup servers for
our Postgres Automatic Failover configured DB (version 9.6 on linux). From
the standpoint of the DB users, can a strategy be implemented such that
they see zero downtime during this process as the 2 servers are taken down
in sequence for their patch, switching the role of primary and backup as
this happens ?

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