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I'm running AWS Elasticache Redis configured with a node type cache.r5.xlarge. Per the configuration, the maxmemory should be 28261849702 (28G). This is gotten from

https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/ParameterGroups.Redis.html#ParameterGroups.Redis.NodeSpecific

However when connecting to the redis endpoint, it's showing only 19G:

(from the 'info' command)

# Memory ... maxmemory:21196387277 maxmemory_human:19.74G maxmemory_policy:volatile-lru ...

I'm wondering if anyone can explain the discrepancy?

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1 Answer 1

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3

Found the reason for this: There's a reserved-memory-percent defaulting to 25 (percent). This is an AWS-specific thing, not part of Redis itself.

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