创建磁盘： qemu-img create -f qcow2 /data/centos73
_2.qcow25G
关闭虚拟机： virsh destroy centos73
编辑配置文件： virsh edit centos73
复制增加如下：注意是vdb，qcow2
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/data/kvm/centos733.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
<disktype='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/data/kvm/centos733_2.qcow2'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000'bus='0x00' slot='0x07' function='0x0'/>(删除，开启domain重新生成)
</disk>
[root@localhost~]# fdisk -l
Disk/dev/vda: 14.0 GB, 13958643712 bytes, 27262976 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
Disk labeltype: dos
Diskidentifier: 0x000b21a9
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 20971519 9436160 8e Linux LVM
/dev/vda3 20971520 27262975 3145728 8e Linux LVM
Disk/dev/vdb: 5368 MB, 5368709120 bytes, 10485760 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
Disk/dev/mapper/cl-root: 11.8 GB, 11802771456 bytes, 23052288 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
Disk/dev/mapper/cl-swap: 1073 MB, 1073741824 bytes, 2097152 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@localhost~]# fdisk /dev/vdb
Welcome tofdisk (util-linux 2.23.2).
Changeswill remain in memory only, until you decide to write them.
Be carefulbefore using the write command.
Device doesnot contain a recognized partition table
Building anew DOS disklabel with disk identifier 0xe3fb71dc.
Command (mfor help): n
Partitiontype:
p primary (0 primary, 0 extended, 4 free)
e extended
Select(default p): p
Partitionnumber (1-4, default 1):
Firstsector (2048-10485759, default 2048):
Usingdefault value 2048
Lastsector, +sectors or +size{K,M,G} (2048-10485759, default 10485759):
Usingdefault value 10485759
Partition 1of type Linux and of size 5 GiB is set
Command (mfor help): p
Disk/dev/vdb: 5368 MB, 5368709120 bytes, 10485760 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
Disk labeltype: dos
Diskidentifier: 0xe3fb71dc
Device Boot Start End Blocks Id System
/dev/vdb1 2048 10485759 5241856 83 Linux
Command (mfor help): t
Selectedpartition 1
Hex code(type L to list all codes): 8e
Changedtype of partition 'Linux' to 'Linux LVM'
Command (mfor help): w
Thepartition table has been altered!
Callingioctl() to re-read partition table.
Syncingdisks.
[root@localhost~]# fdisk -l
Disk/dev/vda: 14.0 GB, 13958643712 bytes, 27262976 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
Disk labeltype: dos
Diskidentifier: 0x000b21a9
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 20971519 9436160 8e Linux LVM
/dev/vda3 20971520 27262975 3145728 8e Linux LVM
Disk/dev/vdb: 5368 MB, 5368709120 bytes, 10485760 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
Disk labeltype: dos
Diskidentifier: 0xe3fb71dc
Device Boot Start End Blocks Id System
/dev/vdb1 2048 10485759 5241856 8e Linux LVM
Disk/dev/mapper/cl-root: 11.8 GB, 11802771456 bytes, 23052288 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
Disk/dev/mapper/cl-swap: 1073 MB, 1073741824 bytes, 2097152 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@localhost~]# pvs
PV VG Fmt Attr PSize PFree
/dev/vda2 cl lvm2 a-- 9.00g 0
/dev/vda3 cl lvm2 a-- 3.00g 0
[root@localhost~]# pvcreate
anaconda-ks.cfg .bash_logout .bashrc .tcshrc
.bash_history .bash_profile .cshrc
[root@localhost~]# pvcreate /dev/vdb1
Physical volume "/dev/vdb1"successfully created.
[root@localhost~]# vgex
vgexport vgextend
[root@localhost~]# vgextend
anaconda-ks.cfg .bash_logout .bashrc .tcshrc
.bash_history .bash_profile .cshrc
[root@localhost~]# vgextend cl /dev/vdb1
Volume group "cl" successfullyextended
[root@localhost~]# vgdisplay
--- Volume group ---
VG Name cl
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 3
Act PV 3
VG Size 16.99 GiB
PE Size 4.00 MiB
Total PE 4349
Alloc PE / Size 3070 / 11.99 GiB
Free PE / Size 1279 / 5.00 GiB
VG UUID Veeoup-1E2G-3E5C-a794-CBrH-C1iY-qrSJzM
[root@localhost~]# lvdisplay
--- Logical volume ---
LV Path /dev/cl/swap
LV Name swap
VG Name cl
LV UUID 4jfTAH-1nQp-XfCX-XVOs-qXwj-REuS-qaSw3Y
LV Write Access read/write
LV Creation host, time localhost.localdomain,2017-08-21 00:13:02 +0800
LV Status available
# open 2
LV Size 1.00 GiB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/cl/root
LV Name root
VG Name cl
LV UUID 7fM2Qm-YRZc-7iG3-OIej-q5jQ-5NnA-Zdnpmv
LV Write Access read/write
LV Creation host, time localhost.localdomain,2017-08-21 00:13:03 +0800
LV Status available
# open 1
LV Size 10.99 GiB
Current LE 2814
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
[root@localhost~]# lvextend
anaconda-ks.cfg .bash_logout .bashrc .tcshrc
.bash_history .bash_profile .cshrc
[root@localhost~]# lvextend /dev/cl/root /dev/vdb1
Size of logical volume cl/root changed from10.99 GiB (2814 extents) to 15.99 GiB (4093 extents).
Logical volume cl/root successfully resized.
[root@localhost ~]# resize2fs /dev/cl/root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open/dev/cl/root
Couldn't find valid filesystem superblock.
[root@localhost~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 11G 1.1G 10G 10% /
devtmpfs 486M 0 486M 0% /dev
tmpfs 497M 0 497M 0% /dev/shm
tmpfs 497M 6.6M 490M 2% /run
tmpfs 497M 0 497M 0% /sys/fs/cgroup
/dev/vda1 1014M 139M 876M 14% /boot
tmpfs 100M 0 100M 0% /run/user/0
[root@localhost~]# resize2fs /dev/mapper/cl-root
resize2fs1.42.9 (28-Dec-2013)
resize2fs:Bad magic number in super-block while trying to open /dev/mapper/cl-root
Couldn'tfind valid filesystem superblock.
[root@localhost~]# xfs_growfs /dev/mapper/cl-root
meta-data=/dev/mapper/cl-root isize=512 agcount=6, agsize=524032 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=2881536, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime=none extsz=4096 blocks=0, rtextents=0
data blockschanged from 2881536 to 4191232
[root@localhost~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 16G 1.1G 15G 7% /
devtmpfs 486M 0 486M 0% /dev
tmpfs 497M 0 497M 0% /dev/shm
tmpfs 497M 6.6M 490M 2% /run
tmpfs 497M 0 497M 0% /sys/fs/cgroup
/dev/vda1 1014M 139M 876M 14% /boot
tmpfs 100M 0 100M 0% /run/user/0
当然也可以按照上面的思路把/dev/vdb 加入到 lvm里面去，测试成功转载于:https://blog.51cto.com/m51cto/1958519
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