Linux:如何不用重启在CentOS 7/ RHEL 7虚拟机中添加一块新硬盘

Linux scott 196℃ 0评论

通常在你在虚拟机中添加一块新硬盘时,你可能会看到新硬盘没有自动加载。这是因为连接到硬盘的SCSI总线需要重新扫描来使得新硬盘可见。这里有一个简单的命令来重新扫描SCSI总线和SCSI设备。下面这几步在CentOS 7 和RHEL 7 中测试过。

  1. 在ESXi或者vCenter中添加一块新的20G硬盘:

    Linux:如何不用重启在CentOS 7/ RHEL 7虚拟机中添加一块新硬盘

    Linux:如何不用重启在CentOS 7/ RHEL 7虚拟机中添加一块新硬盘

  2. 显示当前磁盘分区:

    [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
    
  3. 确定主机总线号

    [root@centos7 ~]# ls /sys/class/scsi_host/
    host0  host1  host2
    
  4. 重新扫描SCSI总线来添加设备

    [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
    
  5. 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:

    [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
    

via: http://www.ehowstuff.com/how-to-add-a-new-hard-disk-without-rebooting-on-centos-7-rhel-7/

作者:skytech 译者:geekpi 校对:wxy

本文由 LCTT 原创翻译,Linux中国 荣誉推出

来源:https://linux.cn/article-5155-1.html

转载请注明:osetc.com » Linux:如何不用重启在CentOS 7/ RHEL 7虚拟机中添加一块新硬盘

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