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# **pvcreate**
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## 选项
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```info
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-f 强制创建物理卷，不需要用户确认
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-u 指定设备的UUID
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-y 所有的问题都回答“yes”
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-Z 是否利用前4个扇区
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```
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### 参数
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物理卷：指定要创建的物理卷对应的设备文件名。
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### 实例
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查看磁盘信息：
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```
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[root@localhost ~]# fdisk -l
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Disk /dev/hda: 41.1 GB, 41174138880 bytes
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255 heads, 63 sectors/track, 5005 cylinders
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Units = cylinders of 16065 * 512 = 8225280 bytes
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Device Boot Start End Blocks id System
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/dev/hda1 * 1 13 104391 83 Linux
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/dev/hda2 14 1288 10241437+ 83 Linux
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/dev/hda3 1289 1925 5116702+ 83 Linux
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/dev/hda4 1926 5005 24740100 5 Extended
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/dev/hda5 1926 2052 1020096 82 Linux swap / Solaris
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/dev/hda6 2053 2235 1469916 8e Linux LVM
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/dev/hda7 2236 2418 1469916 8e Linux LVM
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/dev/hda8 2419 2601 1469916 8e Linux LVM
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/dev/hda9 2602 2784 1469916 8e Linux LVM
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```
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检查有无 PV 在系统上，然后将`/dev/hda6`到`/dev/hda9`建立成为PV格式
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```
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[root@localhost ~]# pvscan
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No matching physical volumes found #找不到任何的 PV 存在！
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```
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将6-9分区转成pv，注意大括号的用途：
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```
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[root@localhost ~]# pvcreate /dev/hda{6,7,8,9}
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Physical volume "/dev/hda6" successfully created
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Physical volume "/dev/hda7" successfully created
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Physical volume "/dev/hda8" successfully created
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Physical volume "/dev/hda9" successfully created
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```
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这就分別表示每个 PV 的信息与系统所有 PV 的信息：
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```
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[root@localhost ~]# pvscan
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PV /dev/hda6 lvm2 [1.40 GB]
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PV /dev/hda7 lvm2 [1.40 GB]
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PV /dev/hda8 lvm2 [1.40 GB]
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PV /dev/hda9 lvm2 [1.40 GB]
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Total: 4 [5.61 GB] / in use: 0 [0 ] / in no VG: 4 [5.61 GB]
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```
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更详细的列示出系统上面每个 PV 信息：
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```
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[root@localhost ~]# pvdisplay
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"/dev/hda6" is a new physical volume of "1.40 GB"
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--- NEW Physical volume ---
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PV Name /dev/hda6 #实际的 partition 分区名称
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VG Name #因为尚未分配出去，所以空白！
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PV Size 1.40 GB #就是容量说明
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Allocatable NO #是否已被分配，结果是 NO
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PE Size (KByte) 0 #在此 PV 內的 PE 大小
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Total PE 0 #共分割出几个 PE
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free PE 0 #沒被 LV 用掉的 PE
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Allocated PE 0 #尚可分配出去的 PE 数量
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PV UUID Z13Jk5-RCls-UJ8B-HzDa-Gesn-atku-rf2biN
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....(底下省略)....
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```
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删除物理卷：
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```
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[root@localhost ~]# pvremove /dev/sdb2
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Labels on physical volume "/dev/sdb2" successfully wiped
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```
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修改物理卷属性：
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```
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[root@localhost ~]# pvchange -x n /dev/sdb1 #禁止分配指定物理卷上的PE
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Physical volume "/dev/sdb1" changed
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1 physical volume changed / 0 physical volumes not changed
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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