ZFS Volumes, UFS, and TRIM

Fabian Keil freebsd-listen at fabiankeil.de
Wed Apr 15 10:13:13 UTC 2015

Bigby James <bigby.james at dimthoughts.com> wrote:

> Hey folks. I'm having some trouble finding info on a specific ZFS use case: I'm
> wondering if a ZFS volume on an SSD, formatted to UFS, is covered by native ZFS
> TRIM support, or if it needs to be enabled on the "embedded" UFS filesystem
> 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.

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