KVM虚拟机差量生产镜像测试(3)

8. 将差量镜像转化成普通镜像，
 
使用qemu-img convert
 
转换差量w2k3-test-01为普通镜像w2k3-test-01-10，格式为qcow2
 
qemu-img convert -f qcow2 -O qcow2 w2k3-test-01 w2k3-test-01-10
 
qemu-img info w2k3-test-01
 
image: w2k3-test-01
 
file format: qcow2
 
virtual size: 8.0G (8589934592 bytes)
 
disk size: 122M
 
cluster_size: 65536
 
backing file: /data/win2003ent32chs
 
qemu-img info w2k3-test-01-10
 
image: w2k3-test-01-10
 
file format: qcow2
 
virtual size: 8.0G (8589934592 bytes)
 
disk size: 3.3G
 
cluster_size: 65536
 
9. 更换镜像的后备镜像
 
-u 参数非安全方式，只是更换镜像
 
不带参数-u，会比较旧的后备镜像和新的后备镜像的差异，以新的镜像为准
 
qemu-img rebase -u -b w2k3-test-01-10 w2k3-test-01
 
qemu-img info w2k3-test-01
 
image: w2k3-test-01
 
file format: qcow2
 
virtual size: 8.0G (8589934592 bytes)
 
disk size: 122M
 
cluster_size: 65536
 
backing file: w2k3-test-01-10