CODEWITHSUNDEEP
amazon-web-servicesredis
seand
seand

Reputation: 5286

AWS ElastiCache redis and maxmemory

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?

Upvotes: 1

Views: 2112

Answers (1)

seand
seand

Reputation: 5286

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.

Upvotes: 3

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