Solved

ESXi 4.1 w/2003 SBS, does the Windows Time service set the bios time?

Posted on 2011-03-10
6
719 Views
Last Modified: 2012-05-11
If I set up Net Time Service on a Windows 2003 Sever, running in ESXi 4.1, does it set the bios or only read it?
0
Comment
Question by:MikeBroderick
6 Comments
 
LVL 30

Expert Comment

by:IanTh
ID: 35094771
no it wouldn't as esx controls the bios so the vm server couldn't set it it will only do the virtual bios clock see what I mean
0
 

Expert Comment

by:tgultekin
ID: 35094790
VMware Tools Time Synchronization and Configuration

When using w32time or NTP in the guest, disable VMware Tools periodic time synchronization.

To disable VMware Tools periodic time sync, use one of these options:

    * Set tools.syncTime = "0" in the configuration file ( .vmx file) of the virtual machine.

      OR

    * Deselect Time synchronization between the virtual machine and the host operating system in the VMware Tools toolbox GUI of the guest operating system.

      OR

    * Run the VMwareService.exe -cmd "vmx.set_option synctime 1 0" command in the guest operating system. VMwareService.exe is typically installed in C:\Program Files\VMware\VMware Tools.

These options do not disable one-time synchronizations done by VMware Tools for events such as tools startup, taking a snapshot, resuming from a snapshot, resuming from suspend, or VMotion. These events synchronize time in the guest operating system with time in the host operating system even if VMware Tools periodic time sync is disabled, so it is important to make sure that the host operating system's time is correct. For more information, see Timekeeping in VMware Virtual Machines.
To ensure the host operating system’s time is correct for VMware ACE, VMware Fusion, VMware GSX Server, VMware Player, VMware Server, and VMware Workstation run time synchronization software such as NTP or w32time in the host. For VMware ESX, run NTP in the service console. For VMware ESXi, run NTP on the VMkernel.

I hope this will answer your question
0
 
LVL 28

Accepted Solution

by:
bgoering earned 500 total points
ID: 35094843
It would work with the "virtual" BIOS in the virtual machine just as it would if Windows was running on a physical box, however the "real" BIOS Clock on the machine ESXi is running on won't be touched.

In a Windows domain environment I would suggest you allow your Windows DC that has the PDC role (that is the authoritive time source for a domain) sync with some external NTP source, then configure your ESXi to Sync its time with the PDC emulator via NTP. That will get the real time clock updated.

Just make sure you don't also select the option in VMware tools to sync the guest time with the host, otherwise they will be fighting a bit and making minute corrections all the time.

Good Luck
0
 

Expert Comment

by:tgultekin
ID: 35094848
0
 

Author Closing Comment

by:MikeBroderick
ID: 35094969
Thank you all for your contributions.
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Suggested Solutions

It Is not possible to enable LLDP in vSwitch(at least is not supported by VMware), so in this article we will enable this, and also go trough how to enabled CDP and how to get this information in vSwitches and also in vDS.
Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
Teach the user how to edit .vmx files to add advanced configuration options Open vSphere Web Client: Edit Settings for a VM: Choose VM Options -> Advanced: Add Configuration Parameters:
This video shows you how easy it is to boot from ISO images for virtual machines with the ISO images stored on a local datastore on the ESXi host.

758 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now