Thank you, @stormi , I'm happy to know that xcp-ng.repo is not touched. These three hosts haven't been rebuilt or restored recently, no hosts have been added, and I did have to make the above modification on each one of them to get them to work. I suppose it's possible I missed the step to remove "mirrors.xcp-ng.org" from xcp-ng.repo during the initial pool build about a year ago and it's just somehow been working with our outbound Internet proxy. In any event, having "mirrors.xcp-ng.org" in our xcp-ng.repo file has definitely caused us problems in the past with our proxy setup. TGIF/DMCV!

I've noticed something that's confusing. In the Tasks tab one of my backup jobs suggests that it is only 1% done, when you expand that task then you can see that both parts are complete. Image for reference: [image: XO6backup.png] I'm guessing that if I nested other jobs, they would also display like this. I don't nest any other jobs because I want to make sure one finishes before another starts, and I don't have many VMs that I'm backing up (I don't have many VMs total). I'd request that if all nested jobs were complete, we get a full circle with 100% or just another green check mark.

@dthenot For anyone stuck, here is what I ended up doing: I've manually hardcoded the controller_uri in /opt/xensource/sm/linstorvolumemanager.py on the new host, restarted the toolstack using xe-toolstack-restart and ran the xe host-call-plugin host-uuid=NEW_HOST_UUID plugin=linstor-manager fn=addHost args:groupName=linstor_group/thin_device command. def _get_controller_uri() -> str: # TODO: Check that an IP address from the current pool is returned. #addresses = _get_controller_addresses() return "linstor://10.25.254.100" #return "linstor://" + addresses[0] if addresses else "" After that, you should see the addHost command return True. It should be safe to revert the change to the _get_controller_uri() function and restart to make sure everything starts properly. [10:06 van3-pprod-xen01 ~]# linstor --controllers 10.25.254.100 node l ╭───────────────────────────────────────────────────────────────────╮ ┊ Node ┊ NodeType ┊ Addresses ┊ State ┊ ╞═══════════════════════════════════════════════════════════════════╡ ┊ van3-pprod-xen01 ┊ COMBINED ┊ 10.25.254.100:3366 (PLAIN) ┊ Online ┊ ┊ van3-pprod-xen02 ┊ COMBINED ┊ 10.25.254.101:3366 (PLAIN) ┊ Online ┊ ┊ van3-pprod-xen03 ┊ COMBINED ┊ 10.25.254.102:3366 (PLAIN) ┊ Online ┊ ┊ van3-pprod-xen04 ┊ COMBINED ┊ 10.25.254.103:3366 (PLAIN) ┊ Online ┊ ╰───────────────────────────────────────────────────────────────────╯ [10:06 van3-pprod-xen01 ~]# xe host-call-plugin host-uuid=f9d94f6c-e826-452f-b9b9-638550b209cf plugin=linstor-manager fn=addHost args:groupName=linstor_group/thin_device True [10:08 van3-pprod-xen01 ~]# linstor --controllers 10.25.254.100 node l ╭───────────────────────────────────────────────────────────────────╮ ┊ Node ┊ NodeType ┊ Addresses ┊ State ┊ ╞═══════════════════════════════════════════════════════════════════╡ ┊ van3-pprod-xen01 ┊ COMBINED ┊ 10.25.254.100:3366 (PLAIN) ┊ Online ┊ ┊ van3-pprod-xen02 ┊ COMBINED ┊ 10.25.254.101:3366 (PLAIN) ┊ Online ┊ ┊ van3-pprod-xen03 ┊ COMBINED ┊ 10.25.254.102:3366 (PLAIN) ┊ Online ┊ ┊ van3-pprod-xen04 ┊ COMBINED ┊ 10.25.254.103:3366 (PLAIN) ┊ Online ┊ ┊ van3-pprod-xen05 ┊ COMBINED ┊ 10.25.254.104:3366 (PLAIN) ┊ Online ┊ ╰───────────────────────────────────────────────────────────────────╯