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Memory configuration

I have vertica cluster with 3 nodes (9.2 comunity edition), each sever have 8CPU and 96Go RAM. I executed a workload test, my CPU consumption was 95% on each server, but vertica did not use all RAM. The first server use 56Go for memory_caches and the 2 others only 13GO. The general resource pool is set to use 95% of memory max size. I try to set memory max size to 120Go, but apparently, I cannot use more than 96Go. did I miss something in configuration?

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