本篇内容介绍了“如何CentOS在不重启的情况下为其虚拟机添加新硬盘”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

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    在ESXi或者vCenter中添加一块新的20G硬盘：
      

显示当前磁盘分区：

代码如下:

[root@centos7 ~]# fdisk -l

   Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
   Units = sectors of 1 * 512 = 512 bytes
   Sector size (logical/physical): 512 bytes / 512 bytes
   I/O size (minimum/optimal): 512 bytes / 512 bytes
   Disk label type: dos
   Disk identifier: 0x0006b96a
      Device Boot      Start         End      Blocks   Id  System
   /dev/sda1   *        2048     1026047      512000   83  Linux
   /dev/sda2         1026048    62914559    30944256   8e  Linux LVM
   Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
   Units = sectors of 1 * 512 = 512 bytes
   Sector size (logical/physical): 512 bytes / 512 bytes
   I/O size (minimum/optimal): 512 bytes / 512 bytes
   Disk /dev/mapper/centos-root: 29.5 GB, 29536288768 bytes, 57688064 sectors
   Units = sectors of 1 * 512 = 512 bytes
   Sector size (logical/physical): 512 bytes / 512 bytes
   I/O size (minimum/optimal): 512 bytes / 512 bytes

确定主机总线号 

代码如下:

[root@centos7 ~]# ls /sys/class/scsi_host/
   host0  host1  host2

重新扫描SCSI总线来添加设备 

代码如下:

[root@centos7 ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
   [root@centos7 ~]# echo "- - -" > /sys/class/scsi_host/host1/scan
   [root@centos7 ~]# echo "- - -" > /sys/class/scsi_host/host2/scan

验证磁盘和分区并确保20GB硬盘已经添加了。在本例中，出现了下面这行 “Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors” 并且可以确认没有重启服务器就添加了新盘： 

代码如下:

[root@centos7 ~]# fdisk -l
   Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
   Units = sectors of 1 * 512 = 512 bytes
   Sector size (logical/physical): 512 bytes / 512 bytes
   I/O size (minimum/optimal): 512 bytes / 512 bytes
   Disk label type: dos
   Disk identifier: 0x0006b96a
      Device Boot      Start         End      Blocks   Id  System
   /dev/sda1   *        2048     1026047      512000   83  Linux
   /dev/sda2         1026048    62914559    30944256   8e  Linux LVM
   Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
   Units = sectors of 1 * 512 = 512 bytes
   Sector size (logical/physical): 512 bytes / 512 bytes
   I/O size (minimum/optimal): 512 bytes / 512 bytes
   Disk /dev/mapper/centos-root: 29.5 GB, 29536288768 bytes, 57688064 sectors
   Units = sectors of 1 * 512 = 512 bytes
   Sector size (logical/physical): 512 bytes / 512 bytes
   I/O size (minimum/optimal): 512 bytes / 512 bytes
   Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
   Units = sectors of 1 * 512 = 512 bytes
   Sector size (logical/physical): 512 bytes / 512 bytes
   I/O size (minimum/optimal): 512 bytes / 512 bytes

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