Jonathan, Dave, Erik, Richard,

As per WP 12886 we reconfigured the DAQD 0 computers.  The goal was to combine the functionality of the data concentrator (DC0) and frame writer (FW0) into one machine, consolidating them to one machine.  This then frees up the other machine for use with pushing data into the NGDD (Next Generation Data Delivery) kafka brokers in LDAS.

At this point h1daqdc0 is no longer the data concentrator.  H1daqfw0 is the data concentrator + frame writer.

This required a few other changes:

•  Moved h1daqfw2's data feed from h1daqnds0 to h1daqnds1
•  Moved a connection between h1daqfw0 and ldasgw0 (to mount the raw minute trends) to h1daqtw0.
  •  This was used to backup trends to their archive location, it also just makes more sense to have this on h1daqtw0.
  •   Installed a NIC in h1daqtw0 as we were out of ports.

Once this work was done and h1daqfw2 was shown to be producing identical frames to h1daqfw[01] work was able to move onto the consolidation.

The basic steps:

• Turn off the rts-transport services on DC0 (dix_xmit, cps_xmit, cps_recv)
• Turn off the rts-transport services on FW0 (dix_recv)
• Reconfigure the networking on FW0 to receive the FE DAQ data stream
  • We had some problems and ended up replacing the optic and the NIC in the FW machine.  We had gotten data flowing, but the frames were not identical.  After some investigation it was found that we were dropping data from the FE systems.  This was traced to errors on the interface.  Erik and Richard cleaned the optics, that didn't help much.  We replaced the optic, that helped, but we still had errors.  Then we replaced the NIC with one of the new NICs we had on hand and the errors went away.
  • If this had happened on DC0 it would have been easy to spot as we would have seen that as CRC errors on the main display.  But FW0 doesn't have those up.
• Reconfigure the networking on FW0 to send data to TW0
• Reconfigure TW0 to run cps_recv to be the data concentrator
• Reconfigure TWo to run cps_xmit (for TW0) and dix_xmit (for the rest of the daqd system)
• Make sure everything is working

the H1:DAQ-DC0 epics variables are used in many places, so Dave and Jonathan configured h1daqfw0 to output H1:DAQ-DC0 epics variables, and put a small IOC together to output the set of H1:DAQ-FW0 variables we need.  This is an area we need to revisit.  One likely approach is to make use of a feature in cps_recv that outputs the daqd STATUS, CRC_CPS, CRC_SUM variables and then to move the daqd on FW0 back to outputing the FW0 variables.

This work validates that we can combine the DC and FW computers into one.

The next step is to turn the old DC machine into the producer for NGDD data.  We will run the fiber to connect it through to LDAS later this week and work on setting that system up.

My checklist for this is in the DCC https://dcc.ligo.org/T2500385