HOST RHEL 5 x86_64 running VMware-server-1.0.10-203137.i386.rpm
vmware server 1 vmware kernel modules seem to be breaking /dev/rtc device
# uname -a Linux localhost 2.6.18-164.15.1.el5 #1 SMP Mon Mar 1 10:56:08 EST 2010 x86_64 x86_64 x86_64 GNU/Linux # hwclock --debug hwclock from util-linux-2.13-pre7 hwclock: Open of /dev/rtc failed, errno=16: Device or resource busy. No usable clock interface found. Cannot access the Hardware Clock via any known method.
seems similar to (some OVER 3 years old !)
http://communities.vmware.com/message/1318682#1318682
http://communities.vmware.com/message/954792#954792
http://communities.vmware.com/thread/84629
http://communities.vmware.com/message/644948
apparent workaround
shutdown all vms
shutdown vmware
adjust/fix your host date/hwclock
restart vmware
restart all vms
regards
clive