Subject: Shift summary for owl 1/14/00
From: Vivian O'Dell (firstname.lastname@example.org)
Date: Fri Feb 04 2000 - 15:23:39 CST
Shift Summary for owl shift, 1/14/00
On Shift: M. Barrio, J. Hamm
Hours of beam available at all intensities: 7
Hours of beam available at nominal intensity: 7
Hours of E799 data (special runs not included): 0
Hours of special runs (laser scans, muon runs...): 5.5
Accounting of lost time: Start/stop run, kfrending, kfrending, kfrending,
Runs ended this shift: 15508, 15509 (short reg)
Tapes brought to FCC this shift: None
Accesses during shift: None
Overview of shift: Kfrending interrupted by occiasional short reg/H data
Description of Shift:
run spill time comment
0:05 l3 monitoring shows that a cpu on ktev2 is taking
too long to process; this leads to frequent daq_
dead alarms (plane 2 memories are not able to
empty by the start of the spill).
Stop run 15508.
0:13 Start run 15509. l3 monitoring looks better, no
daq_dead alarms. However, the trigger is now
hanging every 15 minutes or so due to a DYC full
in crate 11 (which contains ADCs for RC, BAG,
UCAL,SA). We try turning off triggers 7 and 15
(which contain UCAL and BAG), but this doesn't
help. For now, we just kfrend each time
4:05 Veritable onslaught of front-end problems. Crate
11 hangs almost every spill; when it doesn't, we
get busies or ktevana errors from a host of other
sources. After repeatedly kfrending, cycling
repeaters, initializing the pipeline, we fall into
a state of despair and page our run manager so
that he, too, may feel our pain.
Leo advises us to try pushing the "reset reg adc
threshold" button on the ktrig window after
kfrending. This button, which apparently
spontaneously appeared without warning sometime
over the past few days, will sparsify some
channels in crate 11, leading to fewer DYC fulls.
This works. The lesson to be learned is: if
you're having intractable problems, and there's
a new button somewhere, try pushing it.
4:45 Already annoyed and frustrated shift person (OK,
it was me) discovers there are NO CLEAN COFFEE
CUPS. Morale plummets.
5:00 We surpass short reg run's goal of 700K reg
2pi events. Now, if we can only meet 799's goal
of 2 x '97....
6:25 Leo calls and instructs us to take a run in the
BEAM_MU_SHORT configuration, so we stop run 15909.
The DAQ really didn't want to stop, though -
triggers kept going, and the stop process hung.
Fresh start, change tapes.
6:55 Start muon run 15512.
Bob T., upon hearing about our troubles, digs out
a post-it note that had been hidden, upside-down,
under the ktrig terminal keyboard,
which reads: 'After every kfrend, please also hit
the reset reg adc threshold button'.
It's a good thing it's time to go home.
Follow up Notes on Previous Shift
Items to Follow up on Next Shift
Is it the 17th yet?
This archive was generated by hypermail 2b27 : Fri Feb 04 2000 - 15:23:41 CST