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Time Configuration in VMWare

Posted on 2014-04-12
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Last Modified: 2016-11-23
Time Configuration in VMWare
If I don't set the date and time correctly here, are all the virtual machines (unless they received date/time from domain controller NOT on this host) supposed to get the date and time from the host every day?

The reason for asking is that I received brand new DELL T320 server and set up VMware.
Not knowing about this "Time Configuration" section in ESX, I installed SBS2011 as VM.
But, the time on SBS2011 continuously 4 hours behind correct time every day even after I manually corrected it. I made sure that system BIOS clock was correct too.
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Question by:sglee
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smksa earned 155 total points
ID: 39996099
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Expert Comment

by:peea
ID: 39996165
>  the time on SBS2011 continuously 4 hours behind correct time every day even after I manually corrected it.

Is the SBS2011 configured in another time zone which just is 4 hours behind your local time?
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Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 155 total points
ID: 39996180
Its really recommended to disable VM syncing with host.

1. Sync ESXi host with external time source

2. Disable VMware tools guest sync with host

3. Sync Windows VMs with PDC emulator in Domain

4. Sync PDC emulator eg DC with same time source as 1.

5. Sync Linux and Unix VMs with 1
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Author Comment

by:sglee
ID: 39996245
NTP addedNTP enabledTime Configuration in VMWare@ peea
"Is the SBS2011 configured in another time zone " --> I checked that already.

@Andy
I added NTP server name  pool.ntp.org like above screenshots. Is that good?
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LVL 121
ID: 39996479
Yes, that's good, now your time on your ESXi server should be correct.

Follow the other Steps above.
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Author Comment

by:sglee
ID: 39996515
Andy,
 
 Are you staying I completed Step 1, but need to following from Step 2 thru 5?
2. Disable VMware tools guest sync with host
3. Sync Windows VMs with PDC emulator in Domain
4. Sync PDC emulator eg DC with same time source as 1.
5. Sync Linux and Unix VMs with 1
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LVL 121
ID: 39997562
That's correct, and Best Practice for Time Sync!
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Author Comment

by:sglee
ID: 39997605
Got you. Thanks.
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LVL 62

Expert Comment

by:gheist
ID: 39997748
Read up vmware timekeeping best practices
Basically it boils down to not using ESXi time but sync time in each guest
And in the other front synching ESXi time for better log co-relation and correct machine bootup clock.
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Author Comment

by:sglee
ID: 39997764
ok
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