Hi @sadesades
So in such case there’d be no “out of the box” sync. You would need to use rsync or similar solution to sync cache folders between instances (those behind load balancer).
As for cache clearing – that depends.
If you can set cache folder sync in a way that content of that folder is monitored on each instance and synced it right away in a “differential way” (so if content of any of those changes, those changes are synced), then it should work out of the box.
If the sync wouldn’t be like that, then you’d need quite a bit of custom code specifically developed for this case that would communicate directly with all other instances of the site when cache is cleared on one. This is doable, technically speaking, but providing this kind of custom code would go out of the scope of this support, I’m afraid.
However, as my colleague mentioned, it is something worth considering and maybe implementing in future – a way to “sync” cache between multiple linked setups. We’ve suggested it to our Hummingbird Team but at this point I’d prefer not to promise anything yet as they’ll need to research this, asses demand for the feature and then possibly work on implementation.
Best regards,
Adam
