Xen主機動態調整CPU和內存

宿主機爲24核cpu，64G內存，上面運行3臺guest，因爲業務的不確定性，不能提前確定多大性能服務器能夠支持，所以開機爲最小配置：4核 8G，以後隨着業務增長動態調整CPU和內存

cat centos1

name = "centos1"

vcpus = 4

maxvcpus = 10

memory = 8192

maxmem = 24576

disk = [ "file:/var/xen/centos1.qcow2,"phy:/dev/sdc,xvdc,w"]

vif = [ "bridge=br0","bridge=br1" ]

on_reboot = "restart"

on_crash = "destroy"

修改內存：

xm mem-set centos1 16384     #調整centos1的內存爲16G

xm mem-set centos1 24576     #調整centos1的內存爲20G

修改cpu：

xm vcpu-list                            #查看cpu的使用

xm vcpu-set centos1 6            #修改centos1的cpu顆數

xm top                                   #查看當前各主機的狀態

快照，做快照需要關機

xm save centos1 centos1.save

xm shutdown centos1

xm restore centos1.save