[CentOS] Shrinking a volume group

Quoting Steve Bergman <steve at rueb.com>:

> When it comes to swap, I'm a big believer that swap is a good thing.

Yes, swap is a good thing.  As long as it is used only to swap out  
never or almost-never used data.  On the other hand, if an app needs 1  
gig of memory, and it really crunches on that data, relaying on swap  
to give it 1 gig of space is a bad idea.  It'll kill machine.

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