不重启在CentOS 7/ RHEL 7虚拟机添加一块新硬盘

yyert

                                                1、在ESX、VMware或vCenter中添加一块新硬盘

2、显示当前磁盘分区
```
fdisk -lDisk /dev/sda: 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
Disk label type: dos
Disk identifier: 0x000a9f38
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048        6143        2048   83  Linux
/dev/sda2   *        6144     1030143      512000   83  Linux
/dev/sda3         1030144    41943039    20456448   8e  Linux LVM
3、查看主机总线号
ls /sys/class/scsi_hosthost0  host1  host2
ls -l /sys/block/sdalrwxrwxrwx 1 root root 0 Dec  5 02:30 /sys/block/sda -> ../devices/pci0000:00/0000:00:10.0/host0/target0:0:0/0:0:0:0/block/sda
4、重新扫描SCSI总线来加载设备
echo "- - -" > /sys/class/scsi_host/host0/scan5、验证磁盘加载情况
ls -l /sys/block/sdb
lrwxrwxrwx 1 root root 0 Dec  5 02:35 /sys/block/sdb -> ../devices/pci0000:00/0000:00:10.0/host0/target0:0:1/0:0:1:0/block/sdb
fdisk -lDisk /dev/sda: 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
Disk label type: dos
Disk identifier: 0x000a9f38
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048        6143        2048   83  Linux
/dev/sda2   *        6144     1030143      512000   83  Linux
/dev/sda3         1030144    41943039    20456448   8e  Linux LVM
Disk /dev/mapper/cl-root: 9206 MB, 9206497280 bytes, 17981440 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/cl-swap: 4294 MB, 4294967296 bytes, 8388608 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/cl-var: 3145 MB, 3145728000 bytes, 6144000 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/cl-home: 4294 MB, 4294967296 bytes, 8388608 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
**