[CentOS] Resizing / partition ?

Hi. 

I know this has probably been discussed a lot so I'm sorry, noob
here.  

I found a good tutorial here:


http://fedorasolved.org/Members/zcat/shrink-lvm-for-new-partition 

My
only problem is understanding this. 

"To calculate the new End sector, ADD
the partition Start sector to the PV PSize, and then add a safety margin of
around 131072 sectors (64MB) to that." 

If anybody has another way of
doing this or any comments that would be great. 

Thanks. 

Armann Jakob
Palsson
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