[linux-lvm] Newbie questions

["Mayank Vasa" <mvasa confluencenetworks com>]

Hi,

I am new to LVM and have some basic questions:

1) From the documentation I have read, I think once you extend/reduce a LV
or VG you don't need to reboot the system. Correct?

2) Assuming 1 is correct, how is the filesystem made aware of the changes?
I'd like to understand the flow of this too.

3) What are LVM snapshots?

TIA.
-mayank.