Linux pvcreate命令|极客笔记

Linux pvcreate命令：创建物理卷。

Linux pvcreate命令功能描述

使用pvcreate命令可以将物理磁盘分区初始化创建为物理卷。

Linux pvcreate命令语法

pvcreate [选项] [物理卷名]

命令中各选项的含义如表所示。

pvcreate命令选项含义

Linux pvcreate命令示例

创建物理卷/dev/sda5和/dev/sda6

[root@rhel ～]# pvcreate /dev/sda5 /dev/sda6
 Physical volume "/dev/sda5" successfully created
 Physical volume "/dev/sda6" successfully created
备注：创建LVM准备工作——创建磁盘分区。
在创建物理卷之前必须先对磁盘进行分区，并且将磁盘分区的类型设置为8e，之后才能将分区初始化为物理卷。
在磁盘上创建磁盘分区/dev/sda5、/dev/sda6和/dev/sda7，每个分区容量都是100GB，文件系统为8e，也就是Linux LVM。

[root@rhel ～]# fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
    switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command(m for help): n
Command action
  e  extended
  p  primary partition(1-4)
e
//在此输入e，开始创建扩展分区
Selected partition 4
First cylinder (19856-65270, default 19856):
//直接按回车键，从磁盘剩余起始柱面开始创建扩展分区
Using default value 19856
Last cylinder, +cylinders or +size{K, M, G} (19856-65270, default 65270):
//直接按回车键，则从第19856个柱面到最后一个柱面均为扩展分区
Using default value 65270
Command(m for help): n
//在此输入n，开始创建第一个逻辑驱动器
First cylinder (19856-65270, default 19856):
//直接按回车键，从磁盘剩余起始柱面开始创建逻辑驱动器
Using default value 19856
Last cylinder, +cylinders or+size{K, M, G}(19856-65270, default 65270): +100G
//在此输入“+100G”，代表创建容量为100GB的逻辑驱动器
Command(m for help): n
First cylinder (32911-65270, default 32911):
Using default value 32911
Last cylinder, +cylinders or+size{K, M, G}(32911-65270, default 65270): +100G
Command(m for help): n
First cylinder (45966-65270, default 45966):
Using default value 45966
Last cylinder, +cylinders or+size{K, M, G}(45966-65270, default 65270): +100G
Command(m for help): t
//在此输入t，开始转换分区类型
Partition number(1-7):5
//输入分区号码，在此输入5，说明要转换/dev/sda5分区的类型
Hex code(type L to list codes):8e
Changed system type of partition 5 to 8e (Linux LVM)
//转换5号分区类型为8e (Linux LVM)
Command(m for help): t
Partition number(1-7):6
Hex code(type L to list codes):8e
Changed system type of partition 6 to 8e (Linux LVM)
Command(m for help): t
Partition number (1-7): 7
Hex code(type L to list codes):8e
Changed system type of partition 7 to 8e (Linux LVM)
Command(m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16： 设备或资源忙．
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
磁盘分区之后，应该重启计算机系统，然后使用以下命令查看当前系统磁盘分区情况。
[root@rhel ～]# fdisk -l /dev/sda
Disk /dev/sda: 536.9 GB, 536870912000 bytes
255 heads, 63 sectors/track, 65270 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00034c36
  Device Boot     Start      End      Blocks   Id  System
/dev/sda1 *         1       13      102400   83   Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2          13    19595   157286400   83   Linux
/dev/sda3        19595    19856     2097152   82   Linux swap/Solaris
/dev/sda4        19856    65270   364794299    5   Extended
/dev/sda5        19856    32910   104862567+   8e   Linux LVM
/dev/sda6        32911    45965   104864256   8e   Linux LVM
/dev/sda7        45966    59020   104864256   8e   Linux LVM
//可以看到/dev/sda5、/dev/sda6和/dev/sda7分区类型ID都是8e