在虚拟机中添加SCSI格式的磁盘做PV时出现如下报错：
root@host1:~# pvcreate /dev/sdb Device /dev/sdb excluded by a filter.
导致问题的原因是添加的磁盘是在另一个虚拟机中新建的，已经有了分区表，现在的虚拟机并不能识别磁盘的分区表，运行parted命令重做分区表，中途需要输入三次命令。
root@host1:~# parted /dev/sdb GNU Parted 3.2 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.
再次运行pvcreate，问是否擦除dos签名，输入y，就可以将磁盘创建为PV了。
pvcreate /dev/sdb
