如何不用重启在CentOS 7/ RHEL 7虚拟机中添加一块新硬盘
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。   在ESXi或者vCenter中添加一块新的20G硬盘：    显示当前磁盘分区： # 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 Di
SCSI 磁盘
157.55.39.120
是的。
微博评论
2015-03-31T12:03:00.000
157.55.39.120
rescan-scsi-bus -r 瞬间搞定
微博评论
2015-03-31T12:03:00.000
42.120.160.52
@我的印象笔记 @BlackJack550
微博评论
2015-03-31T12:33:01.000
42.120.160.52
virsh命令就可以直接搞定啊。
微博评论
2015-03-31T12:33:01.000
106.120.101.58
@我的印象笔记 //@Linux中国://@kulong0105: virsh命令就可以直接搞定啊。
微博评论
2015-03-31T13:02:53.000
106.120.101.58
方便 //@Linux中国://@kulong0105: virsh命令就可以直接搞定啊。
微博评论
2015-03-31T13:02:53.000
124.207.192.114
[酷]
微博评论
2015-03-31T13:31:14.000
223.73.118.194
先收藏了
lyhabc
2015-04-01T00:11:42.000
183.39.89.184
赞，太给力了
ydcentpc [Chrome 59.0|Windows 7]
2017-09-25T17:02:02.000
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。   在ESXi或者vCenter中添加一块新的20G硬盘：    显示当前磁盘分区： # 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 Di
![](/data/attachment/album/201503/30/140713czz74ezv2oz996sp.jpg)


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：


![](/data/attachment/album/201503/30/140034bs9bzqap4x033349.png)
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](http://www.ehowstuff.com/author/mhstar/) 译者：[geekpi](https://github.com/geekpi) 校对：[wxy](https://github.com/wxy)


本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出

