From: | Stephen Frost <sfrost(at)snowman(dot)net> |
---|---|
To: | norbert poellmann <np(at)ibu(dot)de> |
Cc: | pgsql-admin(at)lists(dot)postgresql(dot)org |
Subject: | Re: Would you ever recommend Shared Disk Failover for HA? |
Date: | 2024-02-26 19:24:25 |
Message-ID: | ZdzlafGnXC4fQAww@tamriel.snowman.net |
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Lists: | pgsql-admin |
Greetings,
* norbert poellmann (np(at)ibu(dot)de) wrote:
> https://www.postgresql.org/docs/current/different-replication-solutions.html
> is listing a shared disk solution for HA.
Yeah. Frankly, it's bad advice and we should remove it. "Rapid
failover" is a bit laughable compared to replication when you consider
that crash recovery can take a very, very long time (depending on how
much outstanding WAL has been written since the last checkpoint but with
extended checkpoints and single-process WAL replay, crash recovery could
be on the order of hours ...) and promoting an online replica takes only
moments.
Ditto for block-based replication.
Probably should talk about WAL shipping more as "Physical Replication".
At the least, physical replication should really be listed first and
then logical replication, perhaps even in a distinct "included as part
of PostgreSQL" section with everything else pushed down to "some other
things exist that you could try"...
Thanks,
Stephen
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