lvm 1 drive fails whole vol data lost

[Markandeya <mrc55519@xxxxxxxxx>]

Dear Friends of CentOS,
I read a reply by John R Pierce, Re:  LVM change disk
December 04, 2010 01:30PM
"do you realize that if any one of those 4 miscellaneous drives fails,
you lose the whole volume?"

Can anyone confirm this? and thank you to John above.

2: can you add(extend) a physical hdd with data to a LV without losing the data?

3: can you remove one hdd to add another of same size and file system
but with different data?

Thanks much. i am about to install and need to know my constraints.
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