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Hi, the doc confirms that data is copied across nodes during vertical scaling (up or down): see https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/redis-cluster-vertical-scaling.html
The scale up and scale down processes rely on creating clusters with newly selected node types
and synchronizing the new nodes with the previous ones.
While the vertical scaling process is designed to remain fully online, it does rely on synchronizing
data between the old node and the new node. We recommend that you initiate scale up/down
during hours when you expect data traffic to be at its minimum.
Best,
Didier
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Since the doc is referred from cluster mode enabled section, can we expect the cluster mode disabled has the same behaviour?