[ntp:questions] help for Ntp architecture

[Vuilmet Nicolas]

Sorry display schemas is bad.
Retry

Le 08/07/2013 10:39, nicolas.vuilmet at laposte.net a écrit :
> Hi,
>
> I have a NTP architecture synchronize hundreds of ntp clients.
> But i know my architecture is bad.
>
> I have 3 time sources (1 GPS and 2 separate radio)
> Each on source is deliver by only one NTP server (stratum 1).
> All clients have in their configuration these three time servers of stratum 1.
> Currently, a source is in maintenance. Its server is now on stratum 12.
> All NTP clients see one of three servers in stratum 12.
> A little outline :
>              x
>              x                GPS                DCF77                MSF
>    stratum 0 x                 ^                   ^                   ^
>              x                 |                   |                   |
>              x             +---+----+         +----+-----+        +----+-------+
>    stratum 1 x             | srv1   |         |   srv2   |        |   srv3     |
>              x             +--------+         +----------+        +------------+
>              x                 ^                   ^                    ^
>              x                 |                   |                    |
>              x                 |                   |                    |
>              x                 |                   +                    |
>              x                 |                +----------+            |
>              x                 |                |          |            |
>              x                 +-----+    +-----------+    | +----------+
>              x                            |    NTP    |    |
>              x                            | CLIENTS   |----+
>              x                   +------------+       |
>              x                   |            |-------+
>              x                   |            |
>              x                   |            |
>              x                   +------------+
>
>
>
> I want to improve this architecture.
> I think add NTP servers to create a stratum 2.
> All NTP servers in stratum 2 synchronize across all stratum 1 servers.
> May be also on them?
> How many stratum 2 servers? tow minimum for high availability, 3 for total security but is it better have more?
> In the end, all clients synchronize only the stratum 2 servers.
>
>
>              x
>              x                GPS                DCF77                MSF
>    stratum 0 x                 ^                   ^                   ^
>              x                 |                   |                   |
>              x             +---+----+         +----+-----+        +----+-------+
>    stratum 1 x             | srv1   |         |   srv2   |        |   srv3     |
>              x             +--------+         +----------+        +------------+
>              x              x                      x                      x
>              x              x                      x                      x
>              x              xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>              x              x                      x                      x
>              x              x                      x                      x
>              x            +---------+         +----------+        +------------+
>    stratum 2 x            |  st21   |         | st22     |        | st23       |
>              x            +---------+         +----------+        +------------+
>              x                 ^                   ^                    ^
>              x                 |                   |                    |
>              x                 |                   |                    |
>              x                 |                   +                    |
>              x                 |                +----------+            |
>              x                 |                |          |            |
>              x                 +-----+    +-----------+    | +----------+
>              x                            |    NTP    |    |
>              x                            | CLIENTS   |----+
>              x                   +------------+       |
>              x                   |            |-------+
>              x                   |            |
>              x                   |            |
>              x                   +------------+
>
>
> Finally, do you have tips on the hardware configuration of the stratum 2 servers? Are there an essential element? (CPU, network, disk.....)
> I read an old server can be enough, but its good for my case? NTP architecture with many clients?
>
> Thx for help.
>
> Nicolas
>
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