Not sure if this is off topic, but anyway.. I used Atto years ago, haven't in a long time. Don't remember GlobalSAN. There was also one with "tree" in its name, don't remember its full name and I think they shut down. The odd thing is that Apple doesn't have one of its own. Way back around 2005 or so they were planning to; I may even have seen a beta of it but that may be a bad memory. But nothing actually shipped. Some searches turned up a few bits of info. One is an open initiator on Github, and a note about it on a list that says turning it on requires disabling some security mechanisms because it's not signed. Perhaps you have the ability to sign your own copy to avoid that. Another is a product called KernSafe that says it has a free Mac OS iSCSI initiator (they also sell a target). I know nothing about it, never tried it. Finally, I found an announcement from GlobalSAN saying they now have Catalina support. So perhaps "broken" has been fixed. paul