[PVE-User] Cross datacenter HA

Michael Rasmussen mir at miras.org
Thu Dec 29 11:50:24 CET 2016

On Thu, 29 Dec 2016 11:23:49 +0100
Emmanuel Kasper <e.kasper at proxmox.com> wrote:

> You could also set up HA beween your two DCs at the application level,
> for instance using a bunch of stateless applications servers connecting
> to a DB, where you want only need to setup HA at the DB level (Hint:
> streaming replication if using PostgreSQL)
A word of caution. If you use Postgres streaming replication in
synchronous mode you must have at least 2 slaves since a write in
this mode requires minimum 2 commits to finish so if you only have one
slave then your cluster will hang if the slave or the master is down
which effectively means you have a single point of failure. Adding an
extra slave makes you resilient to one node down.

Michael Rasmussen

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