...
- How much serving capacity will need to be reserved versus the amount that a host can act as backup for?
- We'll need some target ratios based on the failure rate of machines in order to trigger migration of shards to less loaded servers
- Shard sizes?
- Static?
- Dynamic?
- Index backup?
- Shard and store along with the values
- How do we shard, though, since it is ordered on a different key
- We still really have no idea what the workload looks like which makes it hard to tell if any of these approaches is reasonable. In particular, we really have no idea how much disk bandwidth we'll really need to make the system work.