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What is default replicas and how do I use it?

What is default replicas and how do I use it?

Jun 28, 2021

The setting defreps (scsp.defaultReplicas), is now policy.replicas min max default (see Replaced Settings (Swarm 17.x and Earlier)).

This default setting is how many replicas you want for each content object (not a context, or bucket/domain), provided that no overriding lifepoint is present on the object and that default > min.

This is the difference between min and default:

  • min overrides lifepoint. You can't have a number of replicas lower than the min value, even if you configure a lower value in a lifepoint.

  • lifepoint overrides default when it is lower than default. However, the lifepoint will not be honored if it is below min.

Examples

If min = 1 and default = 2, an object written without a lifepoint will have 2 replicas.

If min = 2, an object written with lifepoint reps=1 will have 2 replicas.

If min = 2 and default = 4, an object written with lifepoint reps=3 in the lifepoint will have 3 replicas.

See Lifepoint Metadata Headers and Implementing Replication Policy.