Description - The amount of memory; RAM, to be used for caching the so called: In-Transit objects, Hot Objects, Negative-Cached objects. This is an optimization feature. Squid can use much more memory than the value specified in this parameter, if you have 48 MB free for Squid, put 48/3 = 16 MB. The value is specified in megabytes.
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maximum_object_size
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Description - Objects larger than this size will NOT be saved on disk. The value is specified in kilobytes.
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cache_dir
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Description - Specifies in this order,
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Which kind of storage system to use; ufs
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The name of the cache directory; /var/spool/squid
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The disk space in megabytes to use under this directory; 3000 Megabytes
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The number of first-level subdirectories to be created under the cache directory; 16 Level-1
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The number of second-level subdirectories to be created under each first-level cache directory; 256 Level-2