Roblox Builds New Cellular Infrastructure to Improve Gaming Experience
Briefly

In an immediate response to the October 2021 outage, Roblox initially built a copy of their infrastructure in a new data center in a different region, in an active-passive style.
Roblox is also implementing a cellular infrastructure to establish robust 'blast walls' within data centers, preventing the failure of an entire data center. Cells, or clusters of machines, offer redundancy and containment of failures within a single cell.
Read at InfoQ
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