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From:   Phillip Susi <phill@thesusis.net>
To:     Luigi Fabio <luigi.fabio@gmail.com>
Cc:     Phil Turmel <philip@turmel.org>, linux-raid@vger.kernel.org
Subject: Re: RAID5 failure and consequent ext4 problems
Date:   Tue, 13 Sep 2022 08:51:25 -0400
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Luigi Fabio <luigi.fabio@gmail.com> writes:

> Well, there are several possible explanations, but persistence is
> desireable - so evidently enumeration occurs according to controller
> order in a repeatable way until something changes in the configuration
> - or until you change kernel, someone does something funny with a
> driver and the order changes. In 28 years of using Linux, however,
> this has happened.. rarely, save for before things were sensible WAY
> back when.

I *think* it is only because the probes are all *started* in the natural
order, so as long as the drives all respond in the same, short amount of
time, you get no surprises.  If one drive decides to take a little
longer to answer today though, it can throw things off.