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This page describes how your Memorystore for Valkey instance behaves during
scaling. To scale capacity up or down, you change the number of
shards in your instance. For information about the different types and sizes of
shards, see Instance and node specification.
To learn how to scale a Memorystore for Valkey instance, see Scale instances.
Impact of scaling
Your instance availability is not impacted during scaling.
During a scaling operation your instance's keyspace is rebalanced. This can
cause increased latency during the scaling operation.
Failure scenarios
If you encounter an error during the scaling operation, it is likely due to one
of the following:
Scaling can fail if you scale to an smaller instance size that
doesn't have the capacity to hold all of the keys currently stored in the
instance.
Scaling can fail if you scale the instance during a period of particularly
high write pressure, for example, during load testing.
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