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If your account is enabled for zfs-send then it is a bhyve VM which has a zpool just for you (which is running on top of our zpool).

I will have to look into this - does your zpool benefit from the metadata cache ? Perhaps not since it is a different zpool ...

The metadata of the zvol on the host pool, does benefit from the metadata vdev (NOT A CACHE)

OK, that is good to know - I will edit the post to reflect that (and also remove the poor use of the word 'cache').