A. Mikkelsen

VMware ESX scripts, commands, tools and other nice to know things that will make your virtualization days easier!!!!

Browsing Posts in Troubleshooting

If you ever need to clear the list of ignored SSL certificates (hosts or vCenters) that you use from the VIclient. Open the “Registry Editor” Locate the key named “HKEY_CURRENT_USER\Software\VMware\Virtual Infrastructure Client\Preferences\UI\SSLIgnore” Delete all certificates needed.  

Using IBM Blades and Cisco switches to run your ESX enviroment? If yes, have you tested what happens if you unplug the network cables going into one switch? If you like me have bundled 2 or more cables going from one switch, to one backbone switch and done the same for the other switch, then […]

After we upgraded to vSphere 4.1, the SCSI adaptor of all our WINXP guests changed from LSI Logic Parallel  to BusLogic Parallel. This change should normally not create any warnings or problems it VMware Tools are up to date. But after the upgrade all our WINXP guests got the following warning when powered on in […]

Yesterday we upgraded one of our vSphere Clusters to 4.1 – it went smoothly 🙂 But today the users reported that they weren’t able to use cut % paste between the guest and their computer using the vSphere Client (Console). After a quick google we found that VMware has tightened the vSphere security by disabling […]

If you need a good guide to Interpreting the statistic from ESXTOP then take a look at this guide from VMware. http://communities.vmware.com/docs/DOC-9279 I’m using it to troubleshoot performance issues (poor response times) from clients in different locations, when using the remote console.

Restarting the Management agents on ESX Server 3.x Login to the ESX host using SSH (or from COS) Type service mgmt-vmware restart. CAUTION Before restarting the Management Agent make sure that Automatic Startup/Shutdown is Disabled For more info see Restarting hostd (mgmt-vmware) on ESX Server Hosts Restarts Hosted Virtual Machines Where Virtual Machine Startup/Shutdown is Enabled […]

Just found this very interesting article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1013109 describing a problem with Windows 2008 and ESX 4 virtual hardware version 7. In short the article states that you might have the disks go offline in a Windows 2008 VM if you Upgrade virtual hardware from version 4 to 7 Installing a new VM with virtual hardware […]

Yesterday I by mistake extended a disk on a VM that had snapshots. Using vmkfstools. Kind of like this thread (http://communities.vmware.com/thread/238035). This resulted in the following PowerOn error: Failed to power on Servername on Host in Cluster: Cannot open the disk ‘/vmfs/volumes/LUN/Folder/VM.vmdk’ Reason: The parent virtual machine disk has been modified since the child was […]

Last week I upgraded a Virtual Center server from Win2003 & MSSQL 2000 (32-bit) to Win2008 & MSSQL 2005 (64-bit). During the installation of vCenter it asked for a 32-bit ODBC even though all the new systems was running 64-bit. After a some time on Google i found that Windows 64-bit also includes a 32-bit […]

Over the past few months we have seen a few Windows servers with a black screen. Meaning You can’t see the logon promt You get a black screen when you connect with RDP We found that the problem was caused by a change in the Windows color scheme. The solution is to copy the color […]