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PUB:20150126 How to Add a New Hard Disk Without Rebooting on CentOS 7 or RHEL 7

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translated/tech/20150126 How to Add a New Hard Disk Without Rebooting on CentOS 7 or RHEL 7.md → published/20150126 How to Add a New Hard Disk Without Rebooting on CentOS 7 or RHEL 7.md
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如何不用重启在CentOS 7/ RHEL 7中添加一块新硬盘
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。
1. 在ESXi或者vCenter中添加一块新的20G硬盘：
![](http://www.ehowstuff.com/wp-content/uploads/2015/01/Create-new-LVM-CentOS7-1.png)
![](http://www.ehowstuff.com/wp-content/uploads/2015/01/Create-new-LVM-CentOS7-1.png)
2. 显示当前磁盘分区：
[root@centos7 ~]# fdisk -l
[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
@ -33,20 +34,22 @@
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
[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
[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” 并且确认新盘添加后没有重启服务器：
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
@ -76,14 +79,14 @@
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][a]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
校对：[wxy](https://github.com/wxy)
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