Re: Would you ever recommend Shared Disk Failover for HA?

From: Ron Johnson <ronljohnsonjr(at)gmail(dot)com>
To: Pgsql-admin <pgsql-admin(at)lists(dot)postgresql(dot)org>
Subject: Re: Would you ever recommend Shared Disk Failover for HA?
Date: 2024-02-23 07:21:48
Message-ID: CANzqJaAUrKfvWgi4tEPgu2r4RPvbNW2HKy8jhA1v5i=8R6DqQg@mail.gmail.com
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On Fri, Feb 23, 2024 at 2:02 AM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
wrote:
[snip]

>
> Anyway, my personal experience with a shared disk setup is a bad one.
>
> Imagine two nodes, redundantly attached to disks mirrored across data
> centers with fibrechannel. No single point of failure, right?
> Well, one day one of the fibrechannel cables had intermittent failures,
> which led to a corrupted file system.
> So we ended up with a currupted file system, nicely mirrored across
> data centers. We had to restore the 3TB database from backup.
>

1. Sounds like both nodes were turned on.
2. Couldn't this happen in /any/ SAN with redundant cabling?

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