Date: Tue, 8 Jan 2019 10:01:44 +0100
From: =?utf-8?B?U3TDqXBoYW5l?= KANSCHINE <stephane@hexack.fr>
To: Natalie Wenz <nataliewenz@gmail.com>
Cc: pgsql-admin@lists.postgresql.org
Subject: Re: Database migration across different operating systems
Message-ID: <20190108090144.rdrtfh6wznoolsww@office.hexack.fr>
References: <A740E5D2-34BE-46AA-A9FE-50F510E771EC@gmail.com>
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Hey !

Le lun.  7 janv., vers 22:51, Natalie Wenz exprimait :
>
> We are in an unusual circumstance, where we need to move all of our
> Postgres 10 databases from their homes on servers running FreeBSD 11
> with ZFS to servers in another data center running Red Hat Linux 7.6
> (also with ZFS), with minimal downtime. 
> 
> I understand that the recommended, safest, approach would be to
> dump/restore. We intend to do that wherever possible. 

It's not anymore since PostgreSQL have logical replication. You can
initialize you FreeBSD cluster with a pg_basebackup and you follow
updates with logical streaming.

> However, we have some databases that require high
> availability/minimal downtime that are also very large. (50 TB, for
> example)

With logical replication, is it's permanently up to date in
miliseconds, you can switch when you want.

> If it helps: The cpu architecture is the same on both hosts, and
> we’ll be running Postgres with the same version and same build
> options. 

Your OS or cpu architecture doesn't matter, really :-)

Regards,
-- 
Stéphane KANSCHINE - https://www.hexack.fr./ - https://www.nuajik.io./
＠ stephane@hexack.fr
  +33 6 64 31 72 52