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uuid ( RO) : 8d6abbaf-0083-41e1-b142-32d9b3731867
name-label ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage
name-description ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage 8GB
sr-uuid ( RO): 8d777639-a9b3-6adb-2ca8-dfa79cf7b16c
virtual-size ( RO): 8589934592
sharable ( RO): false
read-only ( RO): false
uuid ( RO) : 3cfbfabd-3a34-46b2-b67f-eac7407d2abb
name-label ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage
name-description ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage 8GB
sr-uuid ( RO): 8d777639-a9b3-6adb-2ca8-dfa79cf7b16c
virtual-size ( RO): 8589934592
sharable ( RO): false
read-only ( RO): false
上面两个虚拟磁盘是在import后，不能被删除， 找半天， 得出办法：
不能被删除的原因是其在使用中，我所可以先将虚拟块驱动器停掉再删除。
1. 先找出虚拟磁盘的UUID
xe vdi-list #找到不能删除的对应的虚拟磁盘，列出一堆，其中下面的两个是要删除的。
uuid ( RO) : 8d6abbaf-0083-41e1-b142-32d9b3731867
name-label ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage
name-description ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage 8GB
sr-uuid ( RO): 8d777639-a9b3-6adb-2ca8-dfa79cf7b16c
virtual-size ( RO): 8589934592
sharable ( RO): false
read-only ( RO): false
uuid ( RO) : 3cfbfabd-3a34-46b2-b67f-eac7407d2abb
name-label ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage
name-description ( RW): Citrix License Server Virtual Appliance 11.13.1 Storage 8GB
sr-uuid ( RO): 8d777639-a9b3-6adb-2ca8-dfa79cf7b16c
virtual-size ( RO): 8589934592
sharable ( RO): false
read-only ( RO): false
2. 根据虚拟磁盘的UUID（vdi-uuid）， 就可以找到磁盘所在的vbd-uuid（virtual block devices）了
xe vbd-list vdi-uuid=8d6abbaf-0083-41e1-b142-32d9b3731867
uuid ( RO) : 469cb6f9-89b3-799a-99c6-0f50973fa633
vm-uuid ( RO): 543858f2-3b95-4460-a4dc-dd2fe4277674
vm-name-label ( RO): Control domain on host: zhengzong
vdi-uuid ( RO): 8d6abbaf-0083-41e1-b142-32d9b3731867
empty ( RO): false
device ( RO): sm/backend/8d777639-a9b3-6adb-2ca8-dfa79cf7b16c/8d6abbaf-0083-41e1-b142-32d9b3731867
xe vbd-list vdi-uuid=3cfbfabd-3a34-46b2-b67f-eac7407d2abb
uuid ( RO) : 59236566-44f1-cb97-777c-8ec3e4a6c879
vm-uuid ( RO): 543858f2-3b95-4460-a4dc-dd2fe4277674
vm-name-label ( RO): Control domain on host: zhengzong
vdi-uuid ( RO): 3cfbfabd-3a34-46b2-b67f-eac7407d2abb
empty ( RO): false
device ( RO): sm/backend/8d777639-a9b3-6adb-2ca8-dfa79cf7b16c/3cfbfabd-3a34-46b2-b67f-eac7407d2abb
3. 然后根据vbd-uuid，将其停掉。
xe vbd-unplug uuid=469cb6f9-89b3-799a-99c6-0f50973fa633
xe vbd-unplug uuid=59236566-44f1-cb97-777c-8ec3e4a6c879
4. 然后就可以删除上面不能删除的虚拟磁盘了
xe vdi-destroy uuid=8d6abbaf-0083-41e1-b142-32d9b3731867
xe vdi-destroy uuid=3cfbfabd-3a34-46b2-b67f-eac7407d2abb
xe help命令可以查看命令帮助