原因是添加的磁盤是在另一個虛擬機中新建的，已經有了分區表，現在的虛擬機並不能識別磁盤的分區表，運行parted命令重做分區表，中途需要輸入三次命令（mklabel msdos -> yes->quit )。
[deployer@guangx-ywjh-xxsf22b002-yh01w ~]$ sudo parted /dev/sdb
GNU Parted 3.1
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) mklabel msdos
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to continue?
Yes/No? yes
(parted) quit
Information: You may need to update /etc/fstab.
