Date: Wed, 21 Nov 2001 10:27:01 -0600
From: Don Holmgren
Subject: Re: 2.5m obslog 20011120 (MJD 52234)
On Wed, 21 Nov 2001, Mike Harvanek wrote:
>
>                        APACHE POINT OBSERVATORY SDSS 2.5M
>
>                                  OBSERVING LOG
>                            Tuesday November 20, 2001
>
>                                   (MJD 52234)
>
.
.
.
>
> At about 23:50 we got the following watcher error for archiver drives id1-6:
>
> poolNRGangTrim (1: Nov 20 23:48:38 MST)
>
> We've never seen this error before.  Can someone please enlighten us?  The
> error was cleared and did not return.
.
.
.
>
> Pete writes:
>
> the archiver caught up so the 40 frames of bias run 2741 are on tape, but
> I don't know about the gang files, etc, that endNight will write.
>
"poolNRGangTrim" is a status entry variable which records the number of
gang files which were deleted (trimmed, because the pool was out of
space) before they were transferred to sdsshost.  Astro gangs are always
transfered - the run will end with a fatal error before these are
trimmed.  Photo gangs, though, can by policy be trimmed before
retrieval, since the information can be reconstructed by analysis of the
imaging frames.
Each of the six imaging computers (ICC's) keeps its own count of
non-retrieved photo gangs.
I'm not sure of the format of the watcher error message - but, I'd guess
one gang from one of the six photo computers didn't make it to sdsshost.
If this was the only instance of this error message, it's likely that
endNight wrote all other photo gang files.
Don Holmgren