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Entry  Thu Mar 11 14:27:56 2021, gautam, Update, CDS, timesync issue? timesync.pngc1lscMods.png
    Reply  Thu Mar 11 18:46:06 2021, gautam, Update, CDS, cds reboot CDSoverview.png
       Reply  Fri Mar 12 03:28:51 2021, Koji, Update, CDS, cds reboot 
          Reply  Fri Mar 12 11:02:38 2021, gautam, Update, CDS, cds reboot timeDrift.png
Message ID: 15905     Entry time: Thu Mar 11 18:46:06 2021     In reply to: 15904     Reply to this: 15910
Author: gautam 
Type: Update 
Category: CDS 
Subject: cds reboot 

Since Koji was in the lab I decided to bite the bullet and do the reboot. I've modified the reboot script - now, it prompts the user to confirm that the time recognized by the FEs are the same (use the IOP model's status screen, the GPSTIME is updated live on the upper right hand corner). So you would do sudo date --set="Thu 11 Mar 2021 06:48:30 PM UTC" for example, and then restart the IOP model. Why is this necessary? Who knows. It seems to be a deterministic way of getting things back up and running for now so we have to live with it. I will note that this was not a problem between 2017 and 2020 Oct, in which time I've run the reboot script >10 times without needing to take this step. But things change (for an as of yet unknown reason) and we must adapt. Once the IOPs all report a green "DC" status light on the CDS overview screen, you can let the script take you the rest of the way again.

The main point of this work was to relax the data rate on the c1lsc model, and this worked. It now registers ~3.2 MB/s, down from the ~3.8 MB/s earlier today. I can now measure 2 loop TFs simultaneously. This means that we should avoid adding any more DQ channels to the c1lsc model (without some adjustment/downsampling of others).


 Holding off on a restart until I decide I have the energy to recover the CDS system from the inevitable crash.

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