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From: Pierre Barre <[email protected]>
To: Nico Williams <[email protected]>
Cc: Seref Arikan <[email protected]>
Cc: [email protected]
Subject: Re: PostgreSQL on S3-backed Block Storage with Near-Local Performance
Date: Thu, 24 Jul 2025 21:50:58 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <aIKNLuEis1DQEOGv@ubby>
References: <[email protected]>
	<CAG1bHGOzCNtDeW0W8gRO7mpW=t7BqWh-iz4kX5VRCPgt_6Tr6Q@mail.gmail.com>
	<[email protected]>
	<aIKNLuEis1DQEOGv@ubby>

It’s not “safe” or “unsafe”, there’s mountains of valid workloads which don’t require synchronous_commit. Synchronous_commit don’t make your system automatically safe either, and if that’s a requirement, there’s many workarounds, as you suggested, it certainly doesn’t make the setup useless.

Best,
Pierre

On Thu, Jul 24, 2025, at 21:44, Nico Williams wrote:
> On Fri, Jul 18, 2025 at 12:57:39PM +0200, Pierre Barre wrote:
>> - Postgres configured accordingly memory-wise as well as with
>>   synchronous_commit = off, wal_init_zero = off and wal_recycle = off.
>
> Bingo.  That's why it's fast (synchronous_commit = off).  It's also why
> it's not safe _unless_ you have a local, fast, persistent ZIL device
> (which I assume you don't).
>
> Nico
> --

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