Reports until 12:30, Saturday 18 October 2014
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 12:30, Saturday 18 October 2014 - last comment - 07:36, Monday 20 October 2014(14513)
CDS model and DAQ restart report, Friday 17th October 2014

model restarts logged for Fri 17/Oct/2014
2014_10_17 07:32 h1fw1

unexpected restart of fw1, looks like additional memory did not fix this. Time will tell if frequency of restarts has been improved.

Comments related to this report
keith.thorne@LIGO.ORG - 07:36, Monday 20 October 2014 (14515)CDS, COC
Link 

We are not seeing these restarts at LLO.  I suspect it is because the H1 DAQ is writing 20% more data to disk

From the DAQ screen captures, I get the following stats

 IFO     Channels       KB/s      Comm Frame       SciFrame
L1       160,950     60,094     1,091,814,337    638,650,407
H1      165,959     65,069     1,296,128,583    790,420,874  
                              + 8%           + 19%           + 23%


So the H1 frame-writers are ingesting 8% more data and writing out ~20% more data to disk.  Since L1 is right at the limit, I am not surprised that H1 is having issues.

Possible solutions are (maybe) faster DAQ computers and (definitely) less data to frames.  I note the L1 science frames (64s long) are just at the 10Mb/s limit while the H1 science frames are 23% over that limit.

L1 may consider not adding the full suite of fast PCAL channels (when that install occurs) to ensure DAQ stability.