Distribute the nodes of an Elasticache cluster across different AZs

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The Elasticache cluster contains 10 shards, as can be seen from the list below. The two nodes in each cluster are all members of the same REplicationGroup. Multi-AZ is disabled and Auto-failover is enabled.

 "CacheClusterId","PreferredAvailabilityZone","ReplicationGroupId"
 'abcde1234-0001-001', 'us-east-1a', 'abcde1234'
 'abcde1234-0002-001', 'us-east-1a', 'abcde1234'
 'abcde1234-0001-002', 'us-east-1b', 'abcde1234'
 'abcde1234-0002-002', 'us-east-1b', 'abcde1234'
 'abcde1234-0003-001', 'us-east-1b', 'abcde1234'
 'abcde1234-0003-002', 'us-east-1a', 'abcde1234'
 'abcde1234-0004-001', 'us-east-1b', 'abcde1234'
 'abcde1234-0004-002', 'us-east-1a', 'abcde1234'
 'abcde1234-0005-001', 'us-east-1a', 'abcde1234'
 'abcde1234-0005-002', 'us-east-1b', 'abcde1234'
 'abcde1234-0006-001', 'us-east-1b', 'abcde1234'
 'abcde1234-0006-002', 'us-east-1a', 'abcde1234'
 'abcde1234-0007-001', 'us-east-1a', 'abcde1234'
 'abcde1234-0007-002', 'us-east-1b', 'abcde1234'
 'abcde1234-0008-001', 'us-east-1b', 'abcde1234'
 'abcde1234-0008-002', 'us-east-1a', 'abcde1234'
 'abcde1234-0009-001', 'us-east-1b', 'abcde1234'
 'abcde1234-0009-002', 'us-east-1a', 'abcde1234'
 'abcde1234-0010-001', 'us-east-1a', 'abcde1234'
 'abcde1234-0010-002', 'us-east-1b', 'abcde1234'

Here, only us-east-1a and us-east-1a are used. us-east-1c and us-east-1d are not used. How to evenly distribute the nodes to the four AZs? (with the cli or console)

Does Multi-AZ needs to be enabled?

Dec 14, 2022 in AWS by Roshan
• 300 points
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