Benjamin Franz schrieb: > nate wrote: >> Akemi Yagi wrote: >> >>> for VMware products including ESX and ESXi. According to their >>> current recommendations, " In all cases use NTP instead of VMware >>> Tools periodic time synchronization." >>> >> I've been using vmware for 10 years, and I've never, ever ever >> gotten NTP to hold sync inside of a VM outside of using a VMI >> enabled kernel. >> > > I've got more than 20 VMs spread over 5 machines (VMware Server 2.x), > both 32 and 64 bit (hosts and VMs) that hold time perfectly using NTP. > > 1) Make *SURE* that 'cpuspeed' and any BIOS 'power saving' modes are > disabled on your host and your VMs. Nothing screws timekeeping like > having the CPU speed vary. > > 2) Use 'divider=10' on your grub kernel boot lines for your virtual > machines. That kernel parameter information is out of date with CentOS 5.4: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427 As Akemi said, users of VMware virtualization products (bare metal hypervisor products like ESX/ESXi and the other solutions) should closely follow the KB article recommendations which are frequently updated. Alexander