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Date: Wed, 15 Apr 2015 12:12:17 +0200
From: Fabian Keil <freebsd-listen@fabiankeil.de>
To: freebsd-questions@freebsd.org
Subject: Re: ZFS Volumes, UFS, and TRIM
Message-ID: <74f939cf.1642c2ae@fabiankeil.de>
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Bigby James <bigby.james@dimthoughts.com> wrote:

> Hey folks. I'm having some trouble finding info on a specific ZFS use cas=
e: I'm
> wondering if a ZFS volume on an SSD, formatted to UFS, is covered by nati=
ve ZFS
> TRIM support, or if it needs to be enabled on the "embedded" UFS filesyst=
em
> written to the zvol itself. I see by the man page that by default the OS =
sees
> the volume as an ordinary GEOM device, which leads me to infer that TRIM =
needs
> to be set using newfs(8) or tunefs(8), but I'm uncertain.

You came to the right conclusion.

Fabian

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