Time Slip - Same LAN - Secondary DC

DustinB3403

So our secondary DC slipped by over 10 minutes, I found it and reset the time with

net time /set /yes

But I'm curious as to why this would have slipped so much, so quickly. I'm not seeing any of our other systems as having slipped in the least.

dafyre

@DustinB3403 said:

So our secondary DC slipped by over 10 minutes, I found it and reset the time with
net time /set /yes
But I'm curious as to why this would have slipped so much, so quickly. I'm not seeing any of our other systems as having slipped in the least.

What is the secondary system set to use for its time server?

DustinB3403

@dafyre Our PDC is the time source.

So maybe the internal clock on this system is shot?

dafyre

@DustinB3403 said:

@dafyre Our PDC is the time source.

So maybe the internal clock on this system is shot?

I know that used to happen if the CMOS battery was dying, but it usually involved a power outage too.

Dashrender

@dafyre said:

@DustinB3403 said:

@dafyre Our PDC is the time source.

So maybe the internal clock on this system is shot?

I know that used to happen if the CMOS battery was dying, but it usually involved a power outage too.

Exactly - did the secondary loose network connectivity or reboot? Should rarely care what the BIOS says after it's up and running. I don't know what the default let's check the PDC to make sure our clock is right setting is?

Mike Davis

I had this happen on a Windows VM where the ESXi host time server was set to nist.time.gov The DNS server was set to a DNS server that I decommissioned about a month after I built the ESXi host... One day the VM restarted, grabbed the time from the host and was off by a bit.

I said that to say we'll need a little more information to be able to figure out why yours drifted...

Jason

@dafyre said:

@DustinB3403 said:

@dafyre Our PDC is the time source.

So maybe the internal clock on this system is shot?

I know that used to happen if the CMOS battery was dying, but it usually involved a power outage too.

Why are you using its internal clock. Set it to a public ntp source as reliable and have it pull from there. You should rarely use the bios clock, and never use it if it's a VM.

http://jackstromberg.com/2013/10/configuring-external-time-source-on-your-primary-domain-controller/

DustinB3403

@Mike-Davis Both of our DC's are physical at the moment.

Our primary DC reaches out to a public time source, and everything else is supposed to sync with that DC.