Jeff,
On Tue, 26 Oct 2010, Jeff Lake - Admin wrote:
Kind-of sounds like I/O contention... what's your disk configuration? Do
you run RAID? If so, what kind? What do you observe if you monitor
"iostat -x 5" while the problem is occuring?
Art,
yes RAID-1
Do you have separate system disk from data, or does everything run off one
mirror? How many disks are in your mirror? Is your LDM queue running off
the same array as the OS and data?
Art
Do the relevant pqact(1) configuration-file entries use the "-flush" or
"-close" option?
Steve,
yes..except EXEC entries, are they needed there?
How are you dividing out the write tasks with LDM? Each pqact only has 32
pipes, so if you are attempting to fit too many products through those
available pipes, there will be lags.
Install system monitoring tools like 'dstat' and 'sysstat', monitor the
disk IO rates before you do something drastic like reformatting or changing
filesystems.
http://ldm01.michiganwxsystem.net/munin/localhost/localhost/index.html
When I have seen problems before, it is almost always a LDM configuration
issue and not having enough pqacts running.
daryl
hmm..
maybe I should look that over
thanks to everyone .. gave me some food for thought..
-Jeff
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Arthur A. Person
Research Assistant, System Administrator
Penn State Department of Meteorology
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