All posts in category Virtual Machine

Unresponsive/BSOD VM’s on ESXi 5.1 and 5.5

Since a few days I got several customers complaining about unresponsive or blue screening VM’s (both Windows 2008 and 2012) on ESXi5.1 and 5.5 environments.¬†Troubleshooting at the customer site pointed out that the vnetflt.sys driver was causing these issues. This driver is part of the vShield Endpoint components that are installed whenever you a) explicitly […]

Failed to attach filter ‘pxdacf_filter’

During a recent customer visit we had a testing environment available on where some VM’s couldn’t be powered on/vMotionned to some of the ESXi Hosts.¬†The error message: An error was received from the ESX host while powering on VM xxxxx. Failed to start the virtual machine. Module DevicePowerOn power on failed. Unable to create virtual […]

How to quickly discover a "VM to Resource Pool" mapping

Everyone knows the situation in where a (s)VMotion asks you to select a Resource Pool. I would love to see that VMware automatically selects the current VM’s Resource Pool but unfortunately we have to make a selection since it defaults to the cluster. When we leave it to default it obviously causes the VM to […]

vSphere: Freezing VMs after deleting a volume from the SAN

We are running a newly designed vSphere 4.0 environment connected to a very big LeftHand iSCSI environment. Lately we discovered some major problems with a couple of VM’s totally freezing for about 30 seconds, this problem seemed to only occur on several VM’s from one specific host, so time to do some research on this […]