1、先取消挂载磁盘，安装一个gdisk工具
yum install -y gdisk
2、分区格式转换，执行以下命令：
# 执行以下命令 [root@nginx-web ~]# gdisk /dev/vdc GPT fdisk (gdisk) version 0.8.10 Partition table scan: MBR: MBR only BSD: not present APM: not present GPT: not present *************************************************************** Found invalid GPT and valid MBR; converting MBR to GPT format in memory. THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by typing 'q' if you don't want to convert your MBR partitions to GPT format! *************************************************************** Command (? for help): w ###输入 w 保存 Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING PARTITIONS!! Do you want to proceed? (Y/N): y ## 输入y，将新的分区表写入/dev/vdc磁盘 OK; writing new GUID partition table (GPT) to /dev/vdc. Warning: The kernel is still using the old partition table. The new table will be used at the next reboot. The operation has completed successfully.
以防万一可以先使用云硬盘备份功能对磁盘进行一个备份，毕竟数据的安全才是第一位!!
