将XEN虚拟机镜像从RHEL(32位)迁移到CentOS(64位)的过程

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　　【环境】
　　Dell R905服务器 (CPU 4路4核，内存32GB，硬盘1.8TB)
　　原操作系统为RHEL 5.2 i386，虚拟机使用xen，上面开了几台虚拟机。
　　【问题】
　　由于32位操作系统不能识别大内存(只认出14GB) ，因此将操作系统重新安装为CentOS 5.6 x86_64。
　　虚拟机镜像和配置文件在重装前备份到NFS服务器上，重装后又拷回。
　　但是启动虚拟机时，发现无法正常启动，虚拟机状态一直处于Running，VNC无法连接，ssh也无法连接，无法ping通虚拟机，虚拟机只能用Shutdown->Force off来关闭。
通过virt-manager以vnc连接虚拟机，出现提示：
　　
console is not yet active for guest
　　【解决】
　　查看xen配置文件
　　[iyunv@211-98-26-3 cacti_collector]# cat cacti_collector
name = "cacti_collector"
uuid = "3d7239be-c5b3-ef78-db6b-9381b26860bd"
maxmem = 2048
memory = 2048
vcpus = 2
builder = "hvm"
kernel = "/usr/lib/xen/boot/hvmloader"
boot = "c"
pae = 1
acpi = 1
apic = 1
localtime = 0
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
device_model = "/usr/lib/xen/bin/qemu-dm"      #此句应改成=> device_model = "/usr/lib64/xen/bin/qemu-dm"
sdl = 0
vnc = 1
vncunused = 1
vnclisten = "127.0.0.1"
keymap = "en-us"
disk = [ "file:/bak/cacti_collector/hda.img,hda,w", ",hdc:cdrom,r", "file:/bak/cacti_collector/hdb.img,hdb,w", "file:/bak/cacti_collector/hdd.img,hdd,w" ]
vif = [ "mac=00:16:3e:6f:a4:8e,bridge=xenbr0,script=vif-bridge" ]
parallel = "none"
serial = "pty"
修改完保存配置文件，然后重启虚拟机，即可正常启动。