Wei: "high availability"? It's only a cache... you can lose the data, no problem.  And you can have multiple caches to back it up.  Worried about perception of HA term. 

Ilija: if we go for a model where all sites have these caches, it will become an important service. Updates, new features, want to refresh the site. Want service to come back quickly.

Wei: reboots should be okay. And you might have a backup xcache anyway. It should be flexible. 

Rob: Understood.. we need a better term.

Wei: Page 4: concerns about stability goals, and what's possible for access via cache or direct to the origin.

Xin: where should it be located within the site?  Ans: close to compute.