需求： VM下 在原来挂载硬盘的基础上，通过LVM扩容此硬盘。 不需要额外挂载硬盘
1、显示硬盘及所属分区情况
[root@localhost ~]# fdisk -l
Disk /dev/sda: 60 GiB, 64424509440 bytes, 125829120 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x8d75991a
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 121634815 121632768 58G 83 Linux
/dev/sda2 121636862 125827071 4190210 2G 5 Extended
/dev/sda5 121636864 125827071 4190208 2G 82 Linux swap / Solaris
Disk /dev/sdb: 19 GiB, 41875931136 bytes, 81788928 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0cbd968b
2、分区：
[root@localhost ~]# fdisk /dev/sdb
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): p
Disk /dev/sdb: 19 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 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: 0x44817895
Device Boot Start End Blocks Id System
增加三个分区的操作/dev/sdb1
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p ##分区类型
Partition number (1-4): 1
First cylinder (1-6527, default 1):
Using default value 1 ##起始块
Last cylinder, +cylinders or +size{K,M,G} (1-6527, default 6527): 回车
Command (m for help): t
Partition number (1-4): 1
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sdb: 19 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 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: 0x44817895
Device Boot Start End Blocks Id System
/dev/sdb1 1 1306 10490413+ 8e Linux LVM
Command (m for help): w ##最后记得保存，写入分区表
The partition table has been altered!
3、创建物理卷PV
[root@localhost ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created #创建成物理卷
4、创建卷组VG
创建卷组vg_server1 将物理卷/dev/sdb1 加入卷组vg_server1
[root@localhost ~]# vgcreate vg_server1 /dev/sdb1
Volume group "vg_server1" successfully created
[root@localhost ~]#
5、创建逻辑卷lV
分在卷组vg_server1创建逻辑卷
[root@localhost ~]# lvcreate -L 19G -n vg_server1_lvm1 vg_server1 # -L指定卷大小，-n 指定逻辑卷名
Logical volume "vg_server1_lvm1" created. #指定跟卷组名
[root@localhost ~]#
[root@localhost ~]# lvdisplay #查看生成的逻辑卷
--- Logical volume ---
LV Path /dev/vg_server1/vg_server1_lvm1
LV Name vg_server1_lvm1
VG Name vg_server1
LV UUID j4UX2E-LuRf-WKgW-9KGH-dBb3-RvAK-PXcORB
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2016-04-14 00:20:54 +0800
LV Status available
# open 0
LV Size 19.00 GiB
Current LE 3840
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
6、格式化
[root@localhost ~]# mke2fs -t ext4 /dev/vg_server1/vg_server1_lvm1
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
inodes, 3932160 blocks
blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=4026531840
block groups
blocks per group, 32768 fragments per group
inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
正在写入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: 完成
This filesystem will be automatically checked every 20 mounts or
days, whichever comes first. Use tune2fs -c or -i to override.
7 创建目录/mnt/lvm1挂载生成逻辑卷
[root@localhost vg_server1]# mount /dev/vg_server1/vg_server1_lvm1 /mnt/lvm1
8、LVM 扩容
VM下载硬盘里从19G改为29G
然后进行分区
root@ubuntu:~#
root@ubuntu:~# fdisk -l
Disk /dev/sda: 60 GiB, 64424509440 bytes, 125829120 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x8d75991a
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 121634815 121632768 58G 83 Linux
/dev/sda2 121636862 125827071 4190210 2G 5 Extended
/dev/sda5 121636864 125827071 4190208 2G 82 Linux swap / Solaris
Disk /dev/sdb: 39 GiB, 41875931136 bytes, 81788928 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0cbd968b
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 39845887 39843840 19G 8e Linux LVM
Disk /dev/mapper/vg_server1-vg_server1_lvm1: 18 GiB, 19327352832 bytes, 37748736 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
#######################################################################################################
root@ubuntu:~# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.25.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sdb: 39 GiB, 41875931136 bytes, 81788928 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0cbd968b
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 39845887 39843840 19G 8e Linux LVM
Command (m for help): n
Partition type
p primary (1 primary, 0 extended, 3 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2): 2
First sector (39845888-81788927, default 39845888):
Last sector, +sectors or +size{K,M,G,T,P} (39845888-81788927, default 81788927):
Created a new partition 2 of type 'Linux' and of size 20 GiB.
Command (m for help): t
Partition number (1,2, default 2): 2
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Device or resource busy
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).
#############################################################################################################
root@ubuntu:~# fdisk -l
Disk /dev/sda: 60 GiB, 64424509440 bytes, 125829120 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x8d75991a
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 121634815 121632768 58G 83 Linux
/dev/sda2 121636862 125827071 4190210 2G 5 Extended
/dev/sda5 121636864 125827071 4190208 2G 82 Linux swap / Solaris
Disk /dev/sdb: 39 GiB, 41875931136 bytes, 81788928 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0cbd968b
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 39845887 39843840 19G 8e Linux LVM
/dev/sdb2 39845888 81788927 41943040 20G 8e Linux LVM
分完区后 执行下面命令， 不然识别不到新分的去
root@ubuntu:~# partprobe
#将分区/dev/sdb2创建为物理卷
root@ubuntu:~# pvcreate /dev/sdb2
Physical volume "/dev/sdb2" successfully created
root@ubuntu:~# vgextend vg_server1 /dev/sdb2 #将物理卷/dev/sdb2 加入卷组vg_server1
Volume group "vg_server1" successfully extended
扩容/dev/vg_server1/vg_server1_lvm1逻辑卷，其中-L指定大小，#+5G 容量增加5G ,如果没有”+“ 表示扩展到多少
root@ubuntu:~# lvextend -L +10G /dev/vg_server1/vg_server1_lvm1 /dev/sdb2
Extending logical volume vg_server1_lvm1 to 28.00 GiB
Logical volume vg_server1_lvm1 successfully resized
[root@localhost lvm1]# /sbin/resize2fs /dev/vg_server1/vg_server1_lvm1 #最后记得用命令resize 扩展逻辑大小
df查看
root@ubuntu:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 57G 6.6G 48G 13% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 988M 4.0K 988M 1% /dev
tmpfs 201M 500K 200M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 1001M 0 1001M 0% /run/shm
none 100M 0 100M 0% /run/user
/dev/mapper/vg_server1-vg_server1_lvm1 28G 44M 26G 1% /opt
