| 1 | pvcreate
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| 2 | ===
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| 3 |
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| 4 | 将物理硬盘分区初始化为物理卷
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| 5 |
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| 6 | ## 补充说明
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| 7 |
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| 8 | **pvcreate命令** 用于将物理硬盘分区初始化为物理卷，以便LVM使用。
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| 9 |
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| 10 | ### 语法
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| 11 |
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| 12 | ```shell
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| 13 | pvcreate(选项)(参数)
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| 14 | ```
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| 15 |
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| 16 | ### 选项
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| 17 |
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| 18 | ```shell
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| 19 | -f：强制创建物理卷，不需要用户确认；
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| 20 | -u：指定设备的UUID；
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| 21 | -y：所有的问题都回答“yes”；
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| 22 | -Z：是否利用前4个扇区。
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| 23 | ```
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| 24 |
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| 25 | ### 参数
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| 26 |
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| 27 | 物理卷：指定要创建的物理卷对应的设备文件名。
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| 28 |
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| 29 | ### 实例
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| 30 |
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| 31 | 查看磁盘信息：
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| 32 |
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| 33 | ```shell
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| 34 | [root@localhost ~]# fdisk -l
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| 35 | Disk /dev/hda: 41.1 GB, 41174138880 bytes
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| 36 | 255 heads, 63 sectors/track, 5005 cylinders
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| 37 | Units = cylinders of 16065 * 512 = 8225280 bytes
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| 38 |
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| 39 | Device Boot Start End Blocks id System
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| 40 | /dev/hda1 * 1 13 104391 83 Linux
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| 41 | /dev/hda2 14 1288 10241437+ 83 Linux
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| 42 | /dev/hda3 1289 1925 5116702+ 83 Linux
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| 43 | /dev/hda4 1926 5005 24740100 5 Extended
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| 44 | /dev/hda5 1926 2052 1020096 82 Linux swap / Solaris
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| 45 | /dev/hda6 2053 2235 1469916 8e Linux LVM
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| 46 | /dev/hda7 2236 2418 1469916 8e Linux LVM
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| 47 | /dev/hda8 2419 2601 1469916 8e Linux LVM
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| 48 | /dev/hda9 2602 2784 1469916 8e Linux LVM
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| 49 | ```
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| 50 |
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| 51 | 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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| 52 |
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| 53 | ```shell
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| 54 | [root@localhost ~]# pvscan
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| 55 | No matching physical volumes found #找不到任何的 PV 存在！
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| 56 | ```
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| 57 |
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| 58 | 将6-9分区转成pv，注意大括号的用途：
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| 59 |
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| 60 | ```shell
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| 61 | [root@localhost ~]# pvcreate /dev/hda{6,7,8,9}
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| 62 | Physical volume "/dev/hda6" successfully created
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| 63 | Physical volume "/dev/hda7" successfully created
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| 64 | Physical volume "/dev/hda8" successfully created
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| 65 | Physical volume "/dev/hda9" successfully created
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| 66 | ```
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| 67 |
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| 68 | 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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| 69 |
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| 70 | ```shell
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| 71 | [root@localhost ~]# pvscan
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| 72 | PV /dev/hda6 lvm2 [1.40 GB]
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| 73 | PV /dev/hda7 lvm2 [1.40 GB]
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| 74 | PV /dev/hda8 lvm2 [1.40 GB]
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| 75 | PV /dev/hda9 lvm2 [1.40 GB]
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| 76 | Total: 4 [5.61 GB] / in use: 0 [0 ] / in no VG: 4 [5.61 GB]
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| 77 | ```
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| 78 |
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| 79 | 更详细的列示出系统上面每个 PV 信息：
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| 80 |
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| 81 | ```shell
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| 82 | [root@localhost ~]# pvdisplay
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| 83 | "/dev/hda6" is a new physical volume of "1.40 GB"
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| 84 | --- NEW Physical volume ---
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| 85 | PV Name /dev/hda6 #实际的 partition 分区名称
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| 86 | VG Name #因为尚未分配出去，所以空白！
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| 87 | PV Size 1.40 GB #就是容量说明
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| 88 | Allocatable NO #是否已被分配，结果是 NO
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| 89 | PE Size (KByte) 0 #在此 PV 內的 PE 大小
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| 90 | Total PE 0 #共分割出几个 PE
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| 91 | free PE 0 #沒被 LV 用掉的 PE
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| 92 | Allocated PE 0 #尚可分配出去的 PE 数量
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| 93 | PV UUID Z13Jk5-RCls-UJ8B-HzDa-Gesn-atku-rf2biN
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| 94 | ....(底下省略)....
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| 95 | ```
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| 96 |
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| 97 | 删除物理卷：
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| 98 |
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| 99 | ```shell
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| 100 | [root@localhost ~]# pvremove /dev/sdb2
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| 101 | Labels on physical volume "/dev/sdb2" successfully wiped
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| 102 | ```
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| 103 |
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| 104 | 修改物理卷属性：
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| 105 |
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| 106 | ```shell
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| 107 | [root@localhost ~]# pvchange -x n /dev/sdb1 #禁止分配指定物理卷上的PE
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| 108 | Physical volume "/dev/sdb1" changed
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| 109 | 1 physical volume changed / 0 physical volumes not changed
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| 110 | ```
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| 111 |
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| 112 |
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