@Jonathan
Here is an answer to your question that hopefully you find helpful!
There are some limitations for a client to access to a peer cache source and please also help check them. A peer cache source rejects requests for content when it meets any of the following conditions at the time a peer requests content:
1)Low battery mode
2)Processor load exceeds 80%
3)Disk I/O has an AvgDiskQueueLength that exceeds 10
4)There are no more available connections to the computer
5)We need consider the size of larger content such as OS upgrade packages. We could compare our need for this content against the available disk space on peer cache sources.
Here are some articles for reference:
https://learn.microsoft.com/en-us/mem/configmgr/core/plan-design/hierarchy/client-peer-cache#guidance-for-cache-management
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