alt Hacker NewsI think the asterisk there is that the special vdev requires redundancy and becomes a mandatory part of your pool.
Some ZFS discussions suggest that an L2ARC vdev can cache the DDT. Do you know if this is correct?
I think the asterisk there is that the special vdev requires redundancy and becomes a mandatory part of your pool.
Some ZFS discussions suggest that an L2ARC vdev can cache the DDT. Do you know if this is correct?
Yes, that's the reason why a dedup vdev that has lower redundancy than your main pool will fail with "mismatched replication level" unless you use the -f (force) flag.
I'm not sure about whether an L2ARC vdev can offload the DDT, but my guess is no given the built-in logic warning against mismatched replication levels.