david.barker@LIGO.ORG - posted 08:09, Tuesday 29 April 2025 - last comment - 08:11, Tuesday 29 April 2025(84164)
DTS ENV EPICS IOC froze when x1dtslogin was rebooted
Following this morning's reboot of x1dtslogin, the EPICS IOC reporting the H2 building DTS environment channels froze with its last values instead of crashing. After 10 minutes this was reported on the main DTS MEDM with a red banner showing a stuck GPS time, but this was not reflected on the CDS Overview.
I have modified DTS.adl, which is used by the CDS overview, to show a red flag if the GPS time stops updating. Attachment shows the new flag and a trend of the DTS air flow channel showing the freeze which started at 07:33 Tue 29apr2025
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dts_tunnel.service and dts_env.service were restarted on cdsioc0 at 08:04 to clear this error.