Vm 热添加<在不重新启动虚拟机,就可以为虚拟机添加硬盘> 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: [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 DeviceBootStartEndBlocksIdSystem /dev/sda1 *2048102604751200083Linux /dev/sda2 102604862914559309442568eLinux 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 [root@centos7 ~]# ls /sys/class/scsi_host/ host0 host1 host2 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 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 DeviceBootStartEndBlocksIdSystem /dev/sda1 *2048102604751200083Linux /dev/sda2 102604862914559309442568eLinux 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