ZFS Is TRIM supported for caching devices?

[abishai]

Is TRIM supported for ZFS caching devices or I need to provide over-provisioning manually to help garbage collector? I found information about TRIM only for general pool members.

 

[SirDice]

I'm not 100% sure but looking at the actual commit that added TRIM support I'd say, yes, it's supported.

http://svnweb.freebsd.org/base?view=revision&revision=240868

 

[User23]

Since FreeBSD 9.2 it is working and it is enabled by default.

# sysctl vfs.zfs.trim

vfs.zfs.trim.enabled: 1
vfs.zfs.trim.txg_delay: 32
vfs.zfs.trim.timeout: 30
vfs.zfs.trim.max_interval: 1