在线扩容

https://cloud.tencent.com/document/product/362/54127

Linux 云服务器内核不低于3.6.0版本

yum install gdisk -y
yum install -y cloud-utils-growpart
growpart /dev/vdb 1
resize2fs /dev/vdb1 
df -TH

离线扩容

https://cloud.tencent.com/document/product/362/54182

内容比较复杂，请参考腾讯云文档

裸数据盘扩展文件系统

https://cloud.tencent.com/document/product/362/53364

resize2fs /dev/vdb
df -TH