新买的服务器，如果系统安装操作不当，可能会由于系统主分区过小，后期安装软件过多就会导致软件无法正常运行的问题，如果不做系统格式化，就需要通过购买新的硬盘来进行挂载和扩容主分区以解决问题。本文主要介绍linux系统磁盘分区、挂载以及扩容主分区的具体操作步骤。

linux挂载磁盘以及扩容主分区

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磁盘分区及挂载

1. 查看当前磁盘分区

   fdisk -l
   

2. 建立新分区

   fdisk /dev/sdb
   

3. 查看已有分区

   fdisk -l
   

4. 格式化分区，建立文件系统

   mkfs.xfs -f /dev/sdb1
   

5. 挂载磁盘

   mount /dev/sdb1 /home/data/
   

6. 查看是否挂载成功

   df -TH /home/data/  
   

扩容主分区

1. 查看已有分区

   fdisk -l
   

2. 查看卷分组

   vgdisplay -v
   

3. 创建物理卷

   pvcreate /dev/sdb1
   

4. 查看结果

   pvdisplay
   

5. 扩展卷分组

   vgextend centos /dev/sdb1
   

6. 查看逻辑卷

   lvdisplay
   

7. 扩展逻辑卷/dev/centos/root

   lvextend -L +100G /dev/centos/root
   

8. 扩大文件系统

   xfs_growfs /dev/centos/root