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Detector Sync » History » Version 10

Version 9 (Peter Shanahan, 12/23/2010 04:50 PM) → Version 10/17 (Holger Meyer, 12/29/2010 11:14 PM)

h1. How to Issue a Detector Sync

h2. If the Rollover watcher is not running:

* ssh novadaq@novadaq-ctrl-master.fnal.gov
* source DAQOperationsTools/nova_setup.sh
* watchRollover.sh
This script displays the number of seconds since the last rollover.
Wait until the display stops warning not to issue a sync.

h2. Issue a synch:

Use the TDU Control Interface to issue a Detector Sync
when the RolloverWatcher isn't warning you:

<pre>
5 seconds since last rollover. 2 until next one.
Not safe to issue synch. Please wait.
66 seconds since last rollover. 1 until next one.
Not safe to issue synch. Please wait.
0 seconds since last rollover. 67 until next one.
Not safe to issue synch. Please wait.
1 seconds since last rollover. 66 until next one.
Not safe to issue synch. Please wait.
2 seconds since last rollover. 65 until next one.
Not safe to issue synch. Please wait.
3 seconds since last rollover. 64 until next one.
4 seconds since last rollover. 63 until next one.
</pre>

h2. Did it work?

You can see whether the synch plausibly worked in [[Do_a_cold_start#Start Command Windows in the Correct Environment, and Launch Applications.|watchSync.sh]] command.

If it worked, the "dcm-usl tcks:" value at the very end of the line should be O(10000) for all DCMs. (Beware of numbers so big they
wrap around the screen!)

<pre>
root@dcm-06= nova: Thu Dec 30 05:13:37.357166 UTC 2010
unix: Thu Dec 30 05:13:37.355697 UTC 2010 dcm-unix usecs: 1469 dcm-usl tcks: 7440
root@dcm-08= nova: Thu Dec 30 05:13:36.181094 UTC 2010
unix: Thu Dec 30 05:13:36.213537 UTC 2010 dcm-unix usecs: -32443 dcm-usl tcks: 6072
root@dcm-09= nova: Thu Dec 30 05:13:38.599521 UTC 2010
unix: Thu Dec 30 05:13:38.504806 UTC 2010 dcm-unix usecs: 94715 dcm-usl tcks: 7808
root@dcm-11= nova: Thu Dec 30 05:13:36.889279 UTC 2010
unix: Thu Dec 30 05:13:36.883937 UTC 2010 dcm-unix usecs: 5342 dcm-usl tcks: 8276
root@dcm-12= nova: Thu Dec 30 05:13:37.649395 UTC 2010
unix: Thu Dec 30 05:13:37.612058 UTC 2010 dcm-unix usecs: 37337 dcm-usl tcks: 6116
root@dcm-13= nova: Thu Dec 30 05:13:36.005681 UTC 2010
unix: Thu Dec 30 05:13:36.245796 UTC 2010 dcm-unix usecs: -240115 dcm-usl tcks: 5240
</pre>