06-26-2019
My guess is that this server is not in a hung state but is running dead slow. The fact that ping still works proves that the vmware guest OS is alive.
This guest OS is either out of memory resource or the whole platform is out of memory resource. Since you are not complaining that other guests are showing any signs of problems I would ask whether a maximum real memory limit was put on this guest when is was configured. If so, as load increases on this guest it could reach a level where it is allowed no more memory and so starts to page like mad. The symptoms of very slow (almost impossible) login are typical of resource limitation. If you were to wait a very long time probably login would eventually complete.
What OS is under VMWare and booting the platform?
Could another guest OS on this platform suddenly be demanding a lot of resource thereby killing other guests?
Could you easily increase the overall RAM on the whole platform to test this theory out?
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LEARN ABOUT FREEBSD
hv_utils
HYPER-V(4) BSD Kernel Interfaces Manual HYPER-V(4)
NAME
hv_utils -- Hyper-V Utilities Driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in the system kernel configuration file:
device hyperv
DESCRIPTION
The hv_utils driver provides time keeping, shutdown and heartbeat functionality for FreeBSD guest partitions running on Hyper-V. Hyper-V is
a hypervisor-based virtualization technology from Microsoft. The hv_utils driver is one of the core drivers required to be present in guest
partitions running on Hyper-V. This driver provides the following functionalities to guest partitions:
(a) Time Keeping: The clock inside the guest partition will remain accurate by synchronizing to the clock on the virtualization server via
Timesync service, and with the help of the pluggable time source device.
(b) Integrated shutdown: Guest partitions running FreeBSD can be shut down from Hyper-V Manager console by using the "Shut down" command.
(c) Heartbeat: This feature allows the virtualization server to detect whether the guest partition is running and responsive.
SEE ALSO
hv_ata_pci_disengage(4), hv_netvsc(4), hv_storvsc(4), hv_vmbus(4)
HISTORY
Support for hv_utils first appeared in FreeBSD 10.0. The driver was developed through a joint effort between Citrix Incorporated, Microsoft
Corporation, and Network Appliance Incorporated.
AUTHORS
FreeBSD support for hv_utils was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.
BSD
September 10, 2013 BSD