There are some that are Linux based. F5 load balancers is a good example. I don't know what strategy they use to avoid it, but as far as I know, you can't rep

There are some that are Linux based. F5 load balancers is a good example. I don't know what strategy they use to avoid it, but as far as I know, you can't replicate your own F5 with whatever GPL compliance code releases they do. But, for some manufacturers, you can. Synology is a good example...see Xpenology.