[time-nuts] Noob question, NTP stratum 1.

[Taka Kamiya]

If you have 100 production servers with database, I am going to strongly discourage you from taking a "home grown" route.  You will need multiple redundant implementation with fail-over.  You mentioned budget.  How much are your bosses willing to pay for consultation fees for failed or corrupted data?  I am assuming you are talking about Oracle RDBMS with minimum of 2 way RAC.  

If you are using collocation services, doesn't the center itself offer ntp service for fee?  
If you need 24 hour hold-over, I will take nothing less than multiple ovenized crystal OSC GPSDO with redundancy per center.  Then feed that into ntp server with multi-location fail over.
If I were responsible for managing such system and if my boss will want me to go cheap route, I will seriously fight it.  If it's successful, your boss will get credit for spending little and getting a big benefit.  WHEN it fails, it's going to be your fault for not mitigating risk sufficiently.  Try pricing out 2 days of consulting fees....

--------------------------------------- 
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
 

    On Monday, July 22, 2019, 10:05:56 AM EDT, wildylion via time-nuts <time-nuts at lists.febo.com> wrote:  
 
 Hello there,

I wanted to ask for advice regarding NTP

Situation 1:
What I currently have is a uBlox M8N GPS puck I'm planning to use with the Raspberry PI. Seems like it should work almost out of the box with some kernel tuning, but I have a question about short term stability in the event of GPS loss - how well will the board hold over if it's lost GPS for, say, 24 hours?

Situation 2:
Also, there's a need for more dependable NTP time sources for our colocated spaces.

What we have is about 100 servers, some of them running DBMS that wouldn't like clock drift at all. After a recent incident involving NTP I've got an idea to install GPSDO time servers in each datacenter and slave them to stratum2's that will be actually distributing time to clients.

All the certified GNSS disciplined clocks are really expensive (way more than the management would approve), so what I'm planning to do is possibly getting a couple LeoNTP units and using them as the root time sources, would this be a good plan? Of course, all the NTP infrastructure will be monitored, and possibly we'll use Stratum 2 servers which would be slaved to GPSDO S1's AND the public NTP pool for sanity checks.

Maybe BG7TBL's units instead of LeoNTP?
Is that a good idea?

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