Archive for category Virtualization

Virtual Box on Mac OS X: Failed to load VMMR0.r0 (VERR_SUPLIB_OWNER_NOT_ROOT)


The permissions on /Applications folder is not correct. It should be owned by root.

Go to Disk Utility and select your disk. Then select Repair Disk Permissions.
If you have a SSD then it will take roughly 5 mins.

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VMWare ESX Server – Server Crash – Purple COS screen

This morning I got a purple screen on a VMWare ESX 4.1.0 running on Dell R510 load with 32 GB RAM and 8 300GB 15K SAS drives. The machine had been up and running without issues for 65 days. It has been hosting 7 virtual machines consisting of 3 heavy weight VMs.

Since this was the first time I got the purple screen I did a bit of digging. Here’s the some info on the crash screen:

ESX 4.1.0 Release Build 260247
COS Panic: Lost HeartBeat @ esxsc_panic +0x43/0x4f
cr0=0x8005003b cr2=0x5c619634 cr3=0xcf60000 cr4=0x660
cpu0: 4096 VMLinux: (0)kernel panic, not syncing, lost heartbeat

A little bit of research on the VMWare KnowledgeBase and found the following links explaining the situation.

Understanding a “Lost Heartbeat” purple diagnostic screen
Understanding an “Oops” purple diagnostic screen

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Citrix Xen Server 5.6 – CDROMMON using 99.9% of CPU


  • Citrix Xen Server 5.6

  • Dell 2950


  • The server is relatively fast at the start up. After few minutes it starts to slow down and then the VMs become virtually unusable.

  • Using Console or SSH run TOP command and you observe that CDROMMON process is taking 99.9% of the CPU


  • Kill the CDROMMON process using: Kill <pid></pid>

  • Disable the CDROM in the BIOS of the physical machine

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How to set up FreeNAS with VMWare

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VMWare ESX: Warning message about resolution and Windows 7 VM goes into suspended mode

This morning I noticed that one of my VMs which is a Windows 7 64-bit running on VMWare VSphere has gone into suspended mode. I looked under Events tab for the VM and saw the following message:

Warning message from xxxxx: Insufficient video RAM. The maximum resolution of the virtual machine will be limited to 1672x1254. To use the configured maximum resolution of 2560x1600, increase the amount of video RAM allocated to this virtual machine by setting svga.vramSize="16384000" in the virtual machine's configuration file.

Having run only server OS on the VMWare ESX servers before I never had to set the video RAM to anything higher than the default but obviously the Windows 7 (and I guess for vista as well) themes require higher amount of video RAM. I set the RAM to 64 MB and that resolved the issue.

You might also want check the power options and make sure it is set to High Performance or a custom power plan where the system does not go to sleep when inactive.

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VMWare ESX: Troubleshooting VM going into suspended mode

There are unlikely times when your VM might go into suspended mode automatically. I usually go through the following steps:

  1. The best way to start troubleshooting is to use the client to browse to the VM and go to the events tab to view any warnings or errors.

  2. Go to Administration and view system logs. There are 5 logs you can check for any related messages.

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How to change IP address on ESX Server

1.) First of all , you must have physical access to the console.

2.) Put your ESX host in Maintenance Mode and disconect it from Virtual Center.

3.) Now you can connect to the console of your ESX host.

4) Remove the old IP adress (by deleting the vswif interface) &#8220;esxcfg-vswif -d vswif0&#8243; (vsfif0 is your interface to remove. Otherwise use the number you need)

5.) Create a new vswif interface with the New IP adress &#8220;esxcfg-vswif -a vswif0 -p &#8220;Service Console&#8221; -i -n -b; (vsfif0 is your interface you work with. Otherwise use the number you need). If you need, replace Service Console with the name of your Service Console portgroup (this one is the default value)

-i is the new IP adresse
-n is your new subnet
-b is your broadcast

6.) Update the default gateway. Open nano &#8220;nano /etc/sysconfig/network file&#8221;
Press “CTRL+O” and “ENTER” then “CTRL+X” to quit

7.) Then you need to restart the interfac. Do a &#8220;esxcfg-vswif <del>s vswif0&#8243; (this will disable the vswif0 interface) and “esxcfgvswif -e vswif0″ (this will enable the vswif0 interface)

8.) You should now update update DNS and your HOSTS files on the workstation. Also what I would do is a “ipconfig /flushdns” and “ipconfig /registerdns” on your Virtual Center server. Only after you should reconect your ESX server host in the Virtual Center.

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Installing ESX from USB

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