Date: Mon, 25 Sep 2006 09:06:39 -0500
From: Kurt Biery
Subject: sdssad4 [Re: 2.5m obslog 20060924 (MJD 54003)]
The problem with sdssad4 last night started out as an error writing to
the pool disk that, unfortunately, hung things up on the disk.  The
reboots of the astro crate succeeded in restarting ad1-4, but ad4
couldn't complete its startup script(s) successfully because it stalled
when trying to talk to the pool disk.  I presume that the power cycle
around 06:00Z included the pool disks.  If so, the power cycling of the
ad4 pool disk cleared its problems, and then the ad4 startup was able to
complete successfully.
In related news, the checksum errors that we have been seeing in astro
gang files from ad4 continued on Friday, Saturday, and Sunday nights
after Fritz swapped the pool disks between ad3 and ad4 Friday afternoon.
Fritz, when you get a chance, will you replace sdssad4 with a spare 5500?
Thanks,
Kurt
kpan@apo.nmsu.edu wrote:
>                       APACHE POINT OBSERVATORY SDSS 2.5M
>
>                                 OBSERVING LOG
>                           Sunday September 24, 2006
>
>                                  (MJD 54003)
>
>---=== OBSERVING TEAM ===---
>
>Swing: Elena Malanushenko
>Night: Kaike Pan, Howard Brewington
>Support: Jon Brinkman (by phone)
>         Mike Harvanek
>
>---=== OBSERVING PLAN ===---
>
>        Science!
>
>---=== OBSERVING SUMMARY ===---
>
>almost whole night was lost to high humidity alghough We scanned 82 N for
>about 40 min but not sure if the data is any good.
>Problems: 1) ad2 dead during on-telescope bias run.
>          2) ad4 dead during another on-telescope bias run, and normal reboot
>          could not get it back. Power cycle astro crates got it back.
>          3) we are not sure if the focus loop is working properly (see log).
>
>
>
>