Slaves control what they work on, and there isn’t any coordination between Slaves. Secondary pool just means that the Slave scans twice for work to do if it didn’t find anything with the primary pool.
This is a Deadline question as old as anything though:
- Render slave priority question (Year 2007)
- Setting priority of render slaves (Year 2008)
- Limiting jobs to pick up on faster machines (Year 2009)
- Prioritize by machine (Year 2011)
This may become the new thread I reference for this question though. Feel free to add your +1 to this (it helps me track who needs it opposed to just having the heart on the topic)