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 OSX
pdb_odsam
PDB_ODSAM(8) PDB_ODSAM(8)
NAME
pdb_odsam - Open Directory account information database for smbd
SYNOPSIS
The pdb_odsam plugin is the default account information database backend used on Mac OS X. It makes users and groups record from Open
Directory available to Samba.
idmap_odsam should always be used in conjunction with the odsam passdb backend.
OPTIONS
odsam: map guest to guest = BOOL
If this is true (the default), pdb_odsam map the literal username "guest" to the configured guest account. This makes "guest" an
alias for the configured guest account regardless of whether an account named "guest" exists or not.
odsam: msglevel = LEVEL
LEVEL is the integer log level at which pdb_odsam should emit log messages. The lower LEVEL is, the more verbose the log messages.
odsam: traceall = BOOL
If this is true, pdb_odsam will emit log messages for all Open Directory calls. If it is false (the default), it will only log
errors.
EXAMPLES
[global]
idmap domain = default
idmap config default:default = yes
idmap config default:backend = odsam
idmap alloc backend = odsam
passdb backend = odsam
odsam: msglevel = 0 # Log at debugging levels
odsam: traceall = no # Do not trace Open Directory calls
BUGS
Please report bugs to Apple.
SEE ALSO
DirectoryService(8), smb.conf(5), smbd(8)
PDB_ODSAM(8)