aLIGO LHO Logbook

H1 CDS (SEI)

david.barker@LIGO.ORG - posted 14:03, Friday 17 February 2017 - last comment - 09:10, Saturday 18 February 2017(34214)

seismon channel access client process running continually

Dan has reconfigured the seismon channel_access_client process on h1hwinj2 to be managed by systemd. This will automatically restart the process if it terminates.

The script currently has a race condition bug, wherein during the clean up of the H1O2 directory of data older than 5 hours, the program trips up on the oldest file being deleted (even though it is not read). Until this bug is fixed, a crashed process will now be respawned. In any event, this feature was required no matter what caused the crash.

Comments related to this report

david.barker@LIGO.ORG - 14:25, Friday 17 February 2017 (34216)

Link

Verified restart system works, the process died and was restarted.

Operators should now be sure to check if seismon reported an earthquake prior to its arrival at LHO. The seismon medm is launched from the sitemap via the SEI pull-down in the main area, last entry is SEISMON.

S, P and R wave arrival times are marked ORANGE if the arrival is more than 2 minutes in the future, YELLOW if between one and two minutes, RED if within the current minute, GREY if in the past.

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david.barker@LIGO.ORG - 09:10, Saturday 18 February 2017 (34231)

Link

oh well, that didn't last long. The restarting appears to have stopped working early this morning at 
Feb 18 2017 02:55:45 PST
We are investigating