I am trying to install F25 on a legacy box that already has a working
Ext4 over LVM over Md raid 1 of 2x2TB disks, and only a single empty non
raid partition on the second disk. The plan is to nondestructively
upgrade the old OS to F25 by keeping both for a while, giving the user
the option to boot the old OS if they want, without any further down
time. Meanwhile I would slowly move the old data over to new dynamic
Btrfs raid1, to take advantage of its gorgeous scrub and autorepair
mechanism. All the work must be done remotely.

The installer is confusing to me. Logic would suggest that you choose
LVM device, then select a Btrfs volume instead of ext4, but there is no
such option!

Another sweaty palmed option would be to accept the ext4 over LVM
install, then remotely online convert to btrfs, yikes! Then add magical
incantations to fstab and/or grub and pray that the next remote reboot
does not turn into a tragedy!
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