Add a New Hard Disk VMWARE Without Rebooting Guest

It is possible to explicitly add or remove a SCSI device or re-scan an entire SCSI bus without rebooting a running Linux VM guest.


1) Add a New Disk To Vm Guest

  • First, you need to add a hard disk by visiting vmware hardware settings menu.
    Click on VM > Settings
  • Alternatively, press CTRL + D to bring to the settings dialog box.
  • Click on Add+ to add new hardware to the guest:
  • Select hardware type Hard disk and click on Next.
  • Select create a new virtual disk and click on Next.
  • Set virtual disk type to SCSI and click on Next
  • Set maximum disk size as per your requirements and click on Next
  • Finally, set the file location and click on Finish.


2) Rescan the SCSI Bus to Add a SCSI Device Without rebooting the VM

A rescan can be issued by typing the following command:

echo "- - -" > /sys/class/scsi_host/host#/scan
fdisk -l
tail -f /var/log/message

Replace host# with actual value such as host0. You can find the scsi_host value using the following command:

# ls /sys/class/scsi_host



Now type the following to send a rescan request:

echo "- - -" > /sys/class/scsi_host/host0/scan
fdisk -l
tail -f /var/log/message


3) Format a New Disk

You can create partition using fdisk and format it using mkfs.ext3 command:

# fdisk /dev/sdc
# mkfs.ext3 /dev/sdc3


4) Create a Mount Point And Update /etc/fstab

# mkdir /disk3

Open /etc/fstab file, enter:

# vi /etc/fstab

Append as follows:

/dev/sdc3               /disk3           ext3    defaults        1 2

Save and close the file.


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