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Date:      Mon, 30 Nov 2020 16:00:21 +1100
From:      Pascal Guitierrez <pascal.guitierrez@gmail.com>
To:        freebsd-fs@freebsd.org
Subject:   Special allocation classes sizing
Message-ID:  <CAHEFGYbABG0L3q4J2SfjNVcbqjwBEG2N4N%2BJ26Dkt_SyJH6icQ@mail.gmail.com>

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Hi there,

We are looking at migrating a rather large existing pool of around 400TB
onto a new pool, taking advantage of the special allocation classes in
12.2-RELEASE (just using the default special, not dedup or small_blocks).

I am about to procure the hardware needed, however I=E2=80=99m not sure how=
 big to
make the special storage layer.

Is there a rough estimate calculation or perhaps I can run zdb on the
existing pool to get an estimate?

Thanks for your time



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