We have a bucket of about 34 million items in a Couchbase 3.0.1 community cluster setup of 6 AWS nodes. The bucket has been allocated 32.1GB of RAM (5482MB per node) and is currently using 29.1GB. If I use the formula provided in the Couchbase documentation ( http://docs.couchbase.com/admin/admin/Concepts/bp-sizingGuidelines.html ) it should use approx. 8.94GB of RAM.
Am I calculating it incorrectly? Below is link to google spreadsheet with all the details. https://docs.google.com/spreadsheets/d/1b9XQn030TBCurUjv3bkhiHJ_aahepaBmFg_lJQj-EzQ/edit?usp=sharing