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Posts from the ‘Virtual Machine’ Category

20
Jan

Allow Virtual machines with duplicate MAC address on vSphere 5.5

In a migration project to VMware vSphere 5.5 I bumped into duplicate MAC address issue (I found out after some investigation).

Some info on the setup.

There are ESXi hosts that we are migrating from 5.0 to 5.5. Some VM’s where 2 VM’s (VM1 and VM2) share the same MAC address (production and test machine).

On ESXi 5.0 these 2 VM’s can run together on the same ESXi host.

I want to move the VM’s to an already upgraded ESXi 5.5 host, the first VM (VM1 moves without any problems. ) For the second VM (VM2) I get following error during vMotion. Same error happens when I cold migrate the VM2 to the same host (ESXi 5.5) as VM1 and try to power VM2 on.

2014-01-20_15-46-12

 

 

 

 

 

 

 

 

 

After some Google research I came across following blog

http://jasonnash.com/2008/08/30/disabling-mac-address-checking-in-vmware/

And adding the advanced setting to VM2 fixed the problem.

31
Oct

Resizing a system or data disk in a virtual machine

I get a lot of questions of students and customers about resizing a virtual disk. This is the reason for this blog.

The following procedure will guide you step by step through the process of resizing (increasing) a disk of a virtual machine.

Before you make virtual hardware changes be sure you have taken a full backup of the virtual machine.

 

NOTE: If you do not want any troubles only increase the disk size. Decreasing can cause loss of data.

 

Flow

 

Increase Disk using diskpart

Step 1: Edit the virtual machine settings and increase the size of the disk (VMDK).

Step 2: Open the console of this virtual machine and start a command prompt.

Step 3: Start diskpart and execute following steps.

list volume
à this gives you a list of the available partitions

select volume x
à select the partition number you want to increase

extend
à this will add the empty disk space into the partition.

Now the partition has increased in size.

NOTE: On Windows 2008 this can be done via the Device Manager / Storage, but I have seen some weird things like showing incorrect partition sizes.

 

Increase Disk using Third Party tool

Since I have some great experiences with the Acronis Disk Director tool I will explain the steps to increase a disk using this tool. Another tool that can be used is e.g. GParted.

Step 1: Be sure you have a boot image (ISO) of the Acronis Disk Director Tool that supports your guest OS.

Step 2: Boot your virtual machine using the boot image ISO. Use the ESC button during booting your virtual machine to activate the “one time boo menu”

Step 3: Select the partition you want to increase and right mouse click on it. Then select “Resize Volume”

Step 4: Increase the disk space of the selected partitions by decreasing the unallocated space to 0

Step 5: After increasing the partition you have to commit the changes.

Step 6: Now you need to reboot your virtual machine after disconnecting the boot image.

8
Jan

Migrating Buslogic to LSI Logic SCSI controller in a Virtual Machine

When you use convertor to migrate a physical machine to a virtual machine you get a BusLogic Controller as SCSI controller. Following is tested on vSphere 4.1 with a Virtual Machine hardware version 7

In the Virtual Machine Settings you see this.

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In your device manager it is present as a VMware SCSI controller

If you want to change this to a LSI Logic SCSI controller because some application may need it like Trend Micro Deep Security – vShield, you have to follow steps below to get it working

Steps to convert

  • Install the latest VMware Tools.
  • Power down the Virtual Machine (try to use the shutdown so your OS is closed correctly.)
  • Edit Settings of the Virtual Machine and add a new disk (can be small because this will be removed afterwards). We cannot add a new SCSI controller without adding a disk.
  • When you add a new disk select a different SCSI-id then the existing SCSI Controller. First number in the ID is the number of the SCSI controller.

     

  • When the disk is updated, the type of the SCSI controller must be changed.

     

  • When the configuration is updated, you can restart the VM
  • In your device manager you now see 2 types of SCSI controllers

     

  • When you see the LSI logic SCSI controller you can shut down the VM again. Then will remove the just added disk and change the type of SCSI Controller 0

     

  • When this is finished you can restart the Virtual Machine
  • After starting the Virtual Machine you see that new hardware is found, now you need to reboot once more. (Last time to reboot).
  • Now for best practices you need to remove all unused devices in you device manager. Therefor you need to start device manager using a special set parameter.
    • set devmgr_show_nonpresent_devices=1
    • devmgmt.msc

If you now select the SCSI and RAID Controllers, you will see some grayed-out devices. These devices should be uninstalled

  • Now you are done.