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From: Riaan Stander <[email protected]>
To: [email protected]
Subject: Re: Postgres IO sweet spot
Date: Wed, 18 Feb 2026 01:42:25 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKAnmmKXs4vpUt-3ML2H4rE4+3MEpHqG-rJVqvLqyaW0rfs3Jg@mail.gmail.com>
References: <[email protected]>
	<CAKAnmmKXs4vpUt-3ML2H4rE4+3MEpHqG-rJVqvLqyaW0rfs3Jg@mail.gmail.com>

> That's an expensive way to provide some HA. What's the business 
> requirement? How does that tie into Postgres? Might be able to do it 
> in other ways.
We used to run a SAN shared between our host servers, but this was 
replaced with Storage Spaces. I think they don't trust Postgres native 
HA capabilities and want some hardware guarantee.

> Yikes! Yes, SSD would be a big win. It's orders of magnitude faster, 
> and just removes so many problems.
I assume it will help, but I fear however that the overhead with a 3 way 
mirror is not going to be solved with just adding SSD. I'm trying to get 
them to rather deploy direct attached NVME/SSD to each Host and then use 
PG HA from there.

> Sorry, I have no numbers to provide you there, but I cannot imagine 
> any amount of tuning is going to be as big a win as going to SSD.
It does take a lot of convincing and arguing though, so concrete number 
help get the point across.

Thanks for the response

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