Swap is perhaps the wrong name; it is really "virtual memory"; virtual 
memory consists of real memory and swap on disk. In Solaris, a page
either exists on the physical swap device or in memory.  Of course, not
all memory is available as the kernel and other caches use a large part
of the memory.

When no swap based disk is in use, then there is sufficient free memory;
reserved is pages reserved, e.g., fork, (pages to copy when copy-on-write
happens) or allocated memory but not written to.

Casper

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