[gentoo-user] LVM: Removing 3 disks and replacing with 1

[Datty]

Hi all,

I've got an LVM setup at the minute that consists of 3x1TB and 3x1.5TB
drives. Its setup with one huge XFS partition with all my data on. I don't
have a backup of any kind and I know thats pretty silly but with the cost
of replicating the whole lot being what it is and the lack of space in my
server for more drives I have to live with it for the minute. Its got to
the point now where I have 200gb free on it and the drives are pretty old
so I'm going to need to get some new storage. I initially want to replace
the 3x1TBs with a single 3TB drive but i've never removed/replaced a drive
in an LVM setup before. I think I understand how it is done, using pvmove
but a lot of the information around it has giant warnings saying backup
before you do it. Has anyone used pvmove before and has it gone as planned
or not? Also, would someone with a 3TB drive be able to give me the exact
size of the drive so I can work out if it will have enough extents to
replace the 3 drives?

Thanks for your help

Oliver