jeffrey.bartlett@LIGO.ORG - posted 19:44, Saturday 23 November 2019 - last comment - 08:38, Sunday 24 November 2019(53456)
EQ Lockloss Relocking Summary
The IFO lost lock at 01:01 (17:01) due to a Mag6.3 earthquake near Adak in the Aleutians. Microseism shot up to 7um/s, ITMX and ETMX ISI ST2 WDs tripped. Reset the WDs and left the IFO trying to relock as the EQ rang down.
Relock Summary:
02:02 (18:02) Set Observatory mode to Lock Acquisition after ALS Green relocked and stayed relocked. ALS Green relocked without operator intervention.
02:04 (18:04) ALS_COMM IR Not Found - Tuned by hand
Took slider from -200 to 0 and found IR
02:10 (18:10) ACQUIRE_DRMI_1F
02:15 (18:15) Dropped to ACQUIRE_PRMI
02:16 (18:16) PRMI locked
02:17 (18:17) Back to ACQUIRE_DRMI_1F
02:20 (18:20) DRMI_1F locked
02:22 (18:22) Lock loss at TURN_ON_BS_STAGE2
02:56 (18:56) Relocked at NLN - NO operator intervention this entire relock cycle
02:57 (18:57) Back in Observing mode
While relocking could not get the Guardian logs, just a blue screen of not so well. This may be due to the Guardian backup Dave B. started on Friday. FYI Guardian ran fine. No slowdowns or any other problems observed, outside of the logs not displaying.
The full guardian log backup is not a factor, it had completed at 23:00 Friday night. I have a crontab which runs every 6 hours to perform an incremental backup (00:07, 06:07, 12:07 and 18:07). These are taking only 15 seconds each time. Perhaps this slow log access another symptom of why we need to reduce the log look back? (ECR E1900337).