Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

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

Posted on 2011-03-10
6
746 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

Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
VMWare & and Storage 10 88
Storage DRS Recommendation Alert 3 59
Incorrect definition of table mysql.proc 7 45
why does expanding the disk on a VDP appliance cause problem 9 28
HOW TO: Install and Configure VMware vSphere Hypervisor 6.5 (ESXi 6.5), Step by Step Tutorial with screenshots. From Download, Checking Media, to Completed Installation.
When rebooting a vCenters 6.0 and try to connect using vSphere Client we get this issue "Invalid URL: The hostname could not parsed." When we get this error we need to do some changes in the vCenter advanced settings to fix the issue.
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:
Teach the user how to install log collectors and how to configure ESXi 5.5 for remote logging Open console session and mount vCenter Server installer: Install vSphere Core Dump Collector: Install vSphere Syslog Collector: Open vSphere Client: Config…

765 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