kvm初体验之八：调整vm的vcpu, memory, disk大小假设host上创建的vm的名字为vm1。
1. 查看vm1的domain information
[root@tanghuimin thm]# virsh dominfo vm1
Id: 10
Name: vm1
UUID: e2597379-5cc5-4ffa-0531-a073a81c5811
OS Type: hvm
State: running
CPU(s): 1
CPU time: 52.6s
Max memory: 1048576 KiB
Used memory: 1048576 KiB
Persistent: yes
Autostart: disable
Managed save: no
Security model: selinux
Security DOI: 0
Security label: system_u:system_r:svirt_t:s0:c790,c799 (enforcing)
2. 修改vm1的vcpu,memory
1）实时修改vcpu，memory
virsh setvcpus vm1 xxx #数值不能超过vm1.xml中配置的vcpu值
virsh setmaxmem vm1 xxx #vm1处于shutoff状态时才能设置成功
virsh setmem vm1 xxx #数值不能超过maxmem
2）配置文件修改vcpu,memory
修改vm1的配置文件
virsh edit vm1
<memory>对应dominfo中的Maxmemory
<currentMemory>对应dominfo中的Usedmemory
<vcpu>对应dominfo中的CPU(s)
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
将vm1先关机再启动即可生效
virsh destroy vm1
virsh start vm1
3. 为vm1扩展一个10G的disk
生成一个大小为10G的磁盘文件/vm/vm1-add
dd if=/dev/zero of=/vm/vm1-add bs=1M count=10240
修改vm1的配置文件
virsh edit vm1
vm1现有的磁盘文件为/vm/vm1
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/vm/vm1'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0'target='0' unit='0'/>
</disk>
在后面追加如下几行
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/vm/vm1-add'/>
<target dev='hdb'bus='ide'/>
<address type='drive' controller='0' bus='0'target='0' unit='1'/>
</disk>
将vm1先关机再启动即可生效
virsh destroy vm1
virsh start vm1
查看vm1的磁盘信息
root@localhost ~]# fdisk -l| grep Disk
Disk /dev/sda: 2147 MB, 2147483648 bytes
Disk identifier: 0x000e3e47
Disk /dev/sdb: 10.7 GB, 10737418240bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_root: 1405 MB, 1405091840 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_swap: 213 MB, 213909504 bytes
Disk identifier: 0x00000000
