The Watchdog Resource Table (WDRT) feature provides addresses of the following registers on the device along with information such as the maximum timer value, timer resolution and other vendor/device information which the guest OS can use to configure and operate the device. It is exposed to the guest OS through BIOS/EFI ACPI tables. The virtual watchdog device is provided by vSphere, but is configured by the guest OS. When the system in the virtual machine is booted again, the watchdog timer helps the guest OS to understand if the restart was caused by a crash. When this happens, an virtual machine reset is issued. This means that if the guest operating system stops responding and cannot recover on its own due insuperable operating system or application faults, the virtual watchdog timer is not reset within the allocated time. It does so by resetting the virtual machine if the guest OS stops responding and cannot recover on its own due insuperable operating system or application faults. When workloads run on vSphere, the virtual equivalent of the watchdog timer helps the guest OS to achieve the same goal.
MAC SHUTDOWN WATCHDOG HOW TO
In this blog post we will introduce the virtual watchdog timer, and discuss how to configure it in vSphere 7.Ī watchdog timer helps the operating system or application to recover from crashes by powering off or resetting the server if the watchdog timer has not been reset by the OS within the programmed time. It is an important function for clustered applications to gain high availability. It enables developers and administrators to have a standard way to know whether the guest operating system (OS) and applications, running inside a virtual machine, have crashed. The new virtual watchdog timer (vWDT) is a new virtual device introduced in vSphere 7.
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