TRIM on ZFS mirror

Dan Nelson dnelson at
Fri Aug 2 14:30:11 UTC 2013

In the last episode (Aug 02), John Andreasson said:
> I read that FreeBSD 9.2 will bring TRIM to ZFS. Does anyone know if this
> works even if the zpool is a mirror?

The vdev type doesn't matter.  It'll work on plain disks, mirrors, and
raidzs.  If for some reason you have a pool built on geom mirrors, it'll
work on that, too, since gmirror forwards BIO_DELETE requests to its

	Dan Nelson
	dnelson at

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