Sheet A-03 · Instrument
Quorum
planner
Set the number of replicas, write and read quorums and zones. The drawing updates live and shows which guarantees you get.
Parameters
- Read-your-writes
- Writes survive node failures
- Reads survive node failures
- Loss of one zone
- Write conflicts
How to read the result
If R + W > N, every read set overlaps the set that acknowledged the latest write, so a client sees its own changes. If 2W > N, two concurrent writes cannot both reach quorum.
The model is simplified: replicas are spread evenly across zones and sloppy quorums, clocks and latency are ignored. For production decisions it is a starting point for a conversation, not a substitute for a survey.