Jibri pool

Does anyone has a manual of a follow up to configure a jibri pool?

At this moment i have 2 jibri instances and 1 jvb… im able to use just 1 recorder… when i try to record another meeting its says all recordings are busy…

I bet im doing something wrong and want to find out by myself before bother the community with something that might be trivial…

So if anyone could share a manual of a follow up would really appreciate it !