使用QCOW2出现错误，提示QCOW2 Storage not supported for the current libguestfs version
参考文献：https://www.virtualizor.com/docs/admin/libguestfs-centos-7-3-fix/
Libguestfs CentOS 7.3 Fix
执行命令
/usr/local/emps/bin/php /usr/local/virtualizor/scripts/guestfs_fix.php
问题解决。