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Date:      Wed, 21 Oct 2020 08:53:07 +0200
From:      Polytropon <>
To:        David Christensen <>
Subject:   Re: FreeBSD using swap even though there's a lot of free memory
Message-ID:  <>
In-Reply-To: <>
References:  <5f8d9d5e14b4c_dad82b12ba6585a44346f@sirportly-app-01.mail> <> <> <> <5f885b772d622_95aa2adab2b9c5b41576495c3@sirportly-app-02.mail> <5f8dad6c5225e_11f782aaeb993e5bc705b@sirportly-app-01.mail> <>

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On Mon, 19 Oct 2020 20:36:10 -0700, David Christensen wrote:
> Updates and upgrades have broken my systems more times than I care to 
> remember.  Now, I take an image of the system drive before upgrading a 
> machine.  If an upgrade misbehaves, hopefully I will catch it quickly 
> and can simply go back to the previous image.  Otherwise, I need to 
> include backup/ restore of system configuration files and/or data when 
> re-imaging.

This is a great opportunity to integrate ZFS-based BEs (boot
environments) into the workflow. They allow you to easily
revert back changes caused by updates if required.

> Perhaps you should consider setting up a staging/ testing environment, 
> update/ upgrade that, and run tests.  If everything looks good, then 
> upgrade the production environment.

This is also possible, and often a good suggestion, if you
can actually create such a "secondary environment"; if you
have to do everything in "live mode", BEs are probably the
best solution.

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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