How to configure p2p and cache

> @bengbeng-pp Currently in Alibaba Cloud, only the Function Compute uses trace prefetching, because it's relatively easier for them to record trace. Some business are reluctant to do such a thing.
>
> I think what you need is Cache + P2P distribution. For each of them DADI has an open-source implementation. By setting up a large scale of SSD cluster, you basically distribute / cache every hot piece of data in the network and thus a mighty network filesystem is formed :-)

Hello，Is there any documentation on how to configure cache and p2p? When I pulled obd format image from registry, I can not see anything from /opt/overlaybd/registry_cache

_Originally posted by @dbfancier in https://github.com/containerd/accelerated-container-image/issues/120#issuecomment-1291546382_