The CentOS system adds a new hard disk to the virtual machine without rebooting

I. Overview

The virtual machine knows that if the system is running to add a new device to the virtual machine, such as a hard disk, the system is not read the new hard disk, because the system will be in the boot to detect hardware devices. But we may also encounter such a situation, such as running a more important program, this time do not want to restart the Linux system, but also need to add a new hard disk, what to do? This is the case today, VMware added a new hard disk, the system does not recognize, so Baidu, there are a lot of articles, but most of them are to set up LVM, I am lazy, do not want to do so complex, finally found a file to tell how to add a new hard drive without restarting and recognize it, So the general operation, and records summarized down.

Second, the test environment:

1.Linux System: CentOS6.5 32bit
2.vmware:8.04
3. Hard drive Type: SCSI---the system can only add SCSI hard drive during power-on operation

Third, the virtual machine to add hard disk

A single file stores virtual disks--and next--the disk file name is filled--and OK

Iv. operating on Linux systems

After adding a new virtual hard disk, you cannot see the device information for the hard disk under Linux:
Fdisk–l--The result doesn't show the information for the new drive

Follow the steps below to make the Linux system reread and recognize the new hard drive:

1. Determine the host bus number:

1:   [root@ineedle~] # ls/sys/class/scsi_host/

2:   host0 host1       Host2

2. Rescan the SCSI bus to add the device :

  1:  [ root  @   Ineedle    ~]  Span style= "background:white; Color:green "># echo"---">/sys/class/scsi_host/host0/scan  

  2:      [ root  @  ineedle    ~]  # echo"---">/sys/class/scsi_host/host1/scan  

  3:      [ root  @  ineedle    ~]  # echo"---">/sys/class/scsi_host/host2/scan  

3. Verify that the drive adds results:

  1:  disk    / dev  / SDC  :   21.5    GB    21474836480    bytes 

2:  255 headssectors   /track2610cylinders

3:Units = Cylinders  of 16065 *  + = 8225280 bytes

4:Sector size (logical/Physical):  + bytes /  + bytes

5:I/O size (Minimum/Optimal):  + bytes /  + bytes

6:   Disk identifier:0 x00000000

  you can see that our newly added hard drive has been properly read by the system.

The CentOS system adds a new hard disk to the virtual machine without rebooting