In order to most effectively use the resources available to it, the ESM will use the majority of available RAM as disk cache - this improves performance and if the RAM is needed for another purpose, the disk cache can be discarded.
To verify if this is the case, please run the command:
on the back-end of your ESM appliance. The output will be similar to this:
The real free RAM value is the second one under free against the -/+ buffers/cache entry.
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