We have four DC's over two sites. The PDC Emulator is configured to use NTP and get its time from our internal NTP source. All other DC's use NT5DS, so they get their time from the PDCE. The Announce Flags setting is 5 on the PDCE and 10 on all the other DC's.
We recently had the PDCE down for a short time. One of the non-PDCE's had a much different time from the others until the PDCE was back up. I think it may have been related to a BIOS flaw on the server hardware that would cause the system to use Universal Time as local time on the CMOS clock, but I don't know that for sure. While I have now updated the BIOS with a new version that corrects that flaw, I am still unsure about what will happen with time if the PDCE goes down again.
What happens with time on the non-PDCE's when the PDC goes offline? Do they then revert to their internal CMOS time clock? If so, is that internal CMOS clock continuously reset from NT5DS while the PDCE is up?
Can all the DC's be set to use NTP, getting their time from the same source?
Thank you for your help with this.