** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine

卸载分区
umount /mnt/mongo
格式化为xfs(会丢失所有数据)
mkfs.xfs /dev/mapper/vg1-lvMongo -f
修改fstab,类型修改为xfs
vim /etc/fstab
change ext4 to xfs
自动挂载
mount -a