[mylvmbackup] needed free partition size

Hi Lenz,

First of all I would like to give my congratulation for mylvmbackup!
:) Very-very useful script.
I've got a question about free space in VG for snapshot. I'm not a LVM
expert, so sorry. If I want to make 15 GB size partition for MySQL
datas (there will InnoDB-only), then how many space I have to leave
free in volume group for snapshot to make backup safely?

(Sorry for my bad English.)

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