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Oh, that's easy. dm-0 corresponds to the logical volume VolGroup00-LogVol00. Since you have only one disk, and only one VG, it's the internal disk.

This is likely due to hyper-threading. Each core supports two threads reported as separate virtual CPUs.

Why would you want to clear it? The cache is available as free memory if an application requires it. This is a better use of memory in case you need to recall the contents of a file that has been...

You are having the standard Linux Newbie Memory Freakout. Cache memory counts as free memory.

Linux uses every spare bit of memory to cache all disk accesses, because memory which sits around...