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93 lines
3.8 KiB
Markdown
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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================================================================================
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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。
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1. 在ESXi或者vCenter中添加一块新的20G硬盘：
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2. 显示当前磁盘分区：
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[root@centos7 ~]# fdisk -l
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----------
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```
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Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk label type: dos
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Disk identifier: 0x0006b96a
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Device Boot Start End Blocks Id System
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/dev/sda1 * 2048 1026047 512000 83 Linux
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/dev/sda2 1026048 62914559 30944256 8e Linux LVM
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Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk /dev/mapper/centos-root: 29.5 GB, 29536288768 bytes, 57688064 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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```
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3. 确定主机总线号
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[root@centos7 ~]# ls /sys/class/scsi_host/
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host0 host1 host2
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4. 重新扫描SCSI总线来添加设备
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[root@centos7 ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
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[root@centos7 ~]# echo "- - -" > /sys/class/scsi_host/host1/scan
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[root@centos7 ~]# echo "- - -" > /sys/class/scsi_host/host2/scan
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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：
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```
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[root@centos7 ~]# fdisk -l
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Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk label type: dos
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Disk identifier: 0x0006b96a
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Device Boot Start End Blocks Id System
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/dev/sda1 * 2048 1026047 512000 83 Linux
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/dev/sda2 1026048 62914559 30944256 8e Linux LVM
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Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk /dev/mapper/centos-root: 29.5 GB, 29536288768 bytes, 57688064 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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```
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--------------------------------------------------------------------------------
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via: http://www.ehowstuff.com/how-to-add-a-new-hard-disk-without-rebooting-on-centos-7-rhel-7/
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作者：[skytech][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[wxy](https://github.com/wxy)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://www.ehowstuff.com/author/mhstar/ |