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As indicated in the comments by Gerard H. Pille, the operating system's page cache will make sure the hot data is stored in memory.
File stevedore
In terms of Varnish this means you can use the file stevedore to store the objects.
Here how you would configure this:
varnishd -s file,/var/lib/varnish/storage,250G
I only focused on the -s parameter in the ...
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