Sherlock's questions

I have primarily used NFS for most of my storage needs but I find my self setting up some iSCSI targets today and had what is likely a super basic question.

When I create an export for an iSCSI target, the LUN I choose does it only have to be unique on this single target, or does it need to be unique on the entire storage network we have?

I was under the impression that when interfacing with iSCSI the end path is IQN with LUN attached to it, which led me to believe then that if I had 3 different arrays, theoretically each one could have an export, a unique IQN and still all have LUN 1 exposed and it wouldn't cause an issue if these three were used as compute storage/block storage etc

We have an OOB/management network we use to loginto storage, hosts etc. We're using VLANs to separate out storage, from hosts, to camera's etc.

We would like to replace this switch with a new one using the previous config but we're wondering what processes, if any, does Xen have running that would utilize the OOB network such as pool communication?

If we take out the current OOB router to replace it, and Xen hosts do not have access to OOB network for a period of time (say 5 minutes?) this is going to cause an issue with Xen?