Vmware tools time synchronization

When multiple providers are present, W32Time determines which one to use, depending on the time provider's reliability and accuracy. The API for implementing plugins is publicly documented here. It provides time from precision clock virtual device to the W32Time.

Precision Clock is a virtual device introduced in vSphere 7. It bypasses the virtual and guest networking stack and leverages a dedicated VM-Hypervisor proprietary paravirtual channel to offer better time synchronization accuracy. Generally, a driver would be required to access a device.

However, the precision clock supports a VMware proprietary paravirtual interface accessible from userspace. Precision Clock is backed by a reference time source in the hypervisor providing clock parameters using which current accurate time can be derived. The virtual machine will keep time with the ESXi host but will respect the timezone. If the time is determined to be wrong, then there are a couple of options.

Besides the periodic time sync checks, there are also some circumstances where a time sync occurs immediately. For a linux guest try running vmware-toolbox-cmd timesync status command. These commands should run from the VMware Tools Install directory. He focuses on Kubernetes and the Tanzu Portfolio of products. Your email address will not be published. For example:. Note : When adding tools. Theme: Illdy. VMware — Disabling Time Synchronization vmtoolsd. Details In the VMware Tools control panel, the time synchronization checkbox is unselected, but you may experience these symptoms: When you suspend a virtual machine, the next time you resume that virtual machine it synchronizes the time to adjust it to the host.

Time is resynchronized when you migrate the virtual machine using vMotion, take a snapshot, restore to a snapshot, shrink the virtual disk, or restart the VMware Tools service in the virtual machine including rebooting the virtual machine. Solution The time synchronization checkbox controls only whether time is periodically resynchronized while the virtual machine is running.