david.barker@LIGO.ORG - posted 16:49, Tuesday 19 August 2014 - last comment - 17:07, Tuesday 19 August 2014(13497)
Timing errors on h1seib2 (BS) and h1seih45
Jim and Dave.
at 15:57 PDT both h1seib2 and h1seih45 suffered a timing fault. The IOP IRIG-B timing channel showed a number of 336685 and 336687 respectively. All user models on these front ends stopped running. The IOP SWWD tripped, zeroing the DAC output voltages.
we were able to ssh onto the machines, and verify the IO Chassis were visible.
After getting permission from the HAM6 commissioning teams, we rebooted the two front ends using the sequence:
- ssh onto the front end and remove them from the Dolphin network
- power down the computers using the front panel power button
- power up the computers using the front panel power button
Both computers rebooted and restarted all their models with no timing errors. Commissioning time constraints due to staff at/in ham6 did not facilitate any lengthy diagnostics of the broken system.
Arnaud, Dave
we just noticed that the safe.snap link from the target area to the userapps area for the ISI systems: ITMX, ITMY and BS were missing. This meant the settings for h1isibs were not restored after the reboot of h1seib2. We put the symbolic links back into the target directories and manually burt restored h1isibs. Why the links disappeared is a mystery.