Right now, despite being two separate pools, the ATS-BEs for both text and upload are configured identically, and in theory could handle traffic for each other.
The upsides of merging the pools:
- cache_upload could gain a lot of storage capacity for its large objects
- cache_text would gain more upstream connection-handling capacity for all its miss/pass traffic
The potential downsides are basically with something going horribly wrong: maybe they start to thrash on objects, or something unforeseen.