Linux 卷管理详解[ pv vg lv] —— 之三

创建基于分区的LV

1、 通过fdisk创建分区，详细步骤省略，可参考如下:
http://blog.csdn.net/wuweilong/article/details/7538647 http://space.itpub.net/?uid-20674423-action-viewspace-itemid-722812
[root@jetsen /]# fdisk /dev/sdc （n\ p\ 1\ +500m\ w\）--创建了500M分区
[root@jetsen /]# fdisk /dev/sdc （n\ p\ 1\ +1024m\ w\）--创建了1G分区

查看分区信息
[root@jetsen /]# fdisk -l /dev/sdc ----分区已经创建成功

Disk /dev/sdc: 536.8 GB, 536870912000 bytes
255 heads, 63 sectors/track, 65270 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 1 62 497983+ 83 Linux
/dev/sdc2 63 187 1004062+ 83 Linux
[root@jetsen /]#

2、 创建基于分区的物理卷
[root@jetsen /]# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created
[root@jetsen /]# pvcreate /dev/sdc2
Physical volume "/dev/sdc2" successfully created

3、 创建卷组：
[root@jetsen /]# vgcreate soft /dev/sdc1 /dev/sdc2
/dev/cdrom: open failed: Read-only file system
/dev/cdrom: open failed: Read-only file system
Attempt to close device '/dev/cdrom' which is not open.
Volume group "soft" successfully created
[root@jetsen /]#

4、 激活卷组
[root@jetsen /]# vgchange -a y soft
0 logical volume(s) in volume group "soft" now active
[root@jetsen /]#

5、 从卷组中删除物理卷
[root@jetsen /]# vgreduce soft /dev/sdc2
Removed "/dev/sdc2" from volume group "soft"
[root@jetsen /]#

6、 添加卷组到物理卷
[root@jetsen /]# vgextend soft /dev/sdc2
/dev/cdrom: open failed: Read-only file system
Attempt to close device '/dev/cdrom' which is not open.
Volume group "soft" successfully extended
[root@jetsen /]#

7、 创建LV
先查看VG的大小，为1.5G，包含2个PV
[root@jetsen /]# vgdisplay soft
--- Volume group ---
VG Name soft
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 1.43 GB
PE Size 4.00 MB
Total PE 366
Alloc PE / Size 0 / 0
Free PE / Size 366 / 1.43 GB
VG UUID D3x6JY-BVIL-C4ld-013H-U2Rq-hb1q-1oOVnx

[root@jetsen /]#
将1.5G共366个PE创建一个LV
[root@jetsen /]# lvcreate -l366 soft -n soft01
Logical volume "soft01" created
[root@jetsen /]#

8、 创建文件系统：
[root@jetsen /]# mkfs.ext4 /dev/soft/soft01
mke4fs 1.41.5 (23-Apr-2009)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
93696 inodes, 374784 blocks
18739 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=385875968
12 block groups
32768 blocks per group, 32768 fragments per group
7808 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first. Use tune4fs -c or -i to override.
[root@jetsen /]#

9、 挂载文件系统
[root@jetsen /]# mkdir /soft
[root@jetsen /]# mount /dev/soft/soft01 /soft
[root@jetsen /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 18G 5.8G 11G 35% /
/dev/sda1 99M 12M 82M 13% /boot
tmpfs 506M 4.0K 506M 1% /dev/shm
/dev/mapper/soft-soft01 1.5G 35M 1.4G 3% /soft