After the power came back on, I had to recover ext and xfs partitions —
# FSCK to clean up bad superblock
lsblk
fsck /dev/sdb
e2fsck -b 32768 /dev/sdb1
mount /dev/sdb1 /var
# xfs_repair for XFS FS on LVM
lvscan # get dev for LVM
mount /dev/fedora/root /mnt/oh
xfs_repair -L /dev/fedora/root
mount /dev/fedora/root /mnt/oh