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，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！！

# 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.

使用fdisk -l 查看，当前磁盘格式就变为了gpt