luke虚拟机扩容（参考芯王国）

芯王国链接https://blog.csdn.net/weixin_40377195/article/details/124515124?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522167160046116800213052341%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=167160046116800213052341&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2_blogfirst_rank_ecpm_v1~rank_v31_ecpm-1-124515124-null-null.blog_rank_default&utm_term=%E7%A3%81%E7%9B%98&spm=1018.2226.3001.4450

pvdisplay sda3显示不可分配是因为没vgextend到对应的VG name。具体指令vgextend centos /dev/sda3，centos为VG name。