What distro and version are you using?
Are those logical volumes local on the server or remote? If local then _netdev would probably not be correct as a mount option.
It looks like you are missing the options field in those fstab entries. Since you posted without using the code tags I can see no space between xfs and _netdev. Is it "xfs_netdev" or "xfs _netdev"? Can't tell.
The lines would be much more readable if they looked like this
Code:
/dev/mapper/fedora-root / ext4 defaults 1 1
instead of this
/dev/mapper/fedora-root / ext4 defaults 1 1
That is the same line posted with code tags and without.