Memory management in 2.1 is not great (2.4.9 kernel). I'm assuming you
are using a hugemem kernel, or it wouldn't access more than 4GB to begin
with.
Check out
/usr/src/linux-2.4.9-e.59/Documentation/sysctl/vm.txt
You also might want to google:
"linux 2.4.9 kernel tuning fileserver sysctl"
There are lots of similarities between NBU and NFS on linux WRT memory
management.
Best answer: Upgrade to 4.3, it made a world of difference for me.
Date: Fri, 27 Oct 2006 14:02:26 -0300
From: "Edson Noboru Yamada" <enyamada at gmail.com>
Subject: [Veritas-bu] Memory usage under rhel 2.1
To: veritas-bu at mailman.eng.auburn.edu
Hi,
I have a media server (NBU 5.1 MP4) running under RHEL 2.1 AS.
The server is a SUN V40Z with 8GB RAM. There are 6 LTO2 tape drives
attached to it.
Under normal circunstances, each job is recorded on two tapes
simultaneously
(on and off-site copy).
My question is regarding the memory usage, which looks too low.
NUMBER_DATA_BUFFERS=64, SIZE_DATA_BUFFERS=524288, and the MPX of each
of the 6 drives is 32.
So, according to the manual, the total shared memory allocate should be:
NUMBER_DATA_BUFFERS x SIZE_DATA_BUFFERS x MPX x Number of drives = 6 GB.
However, using linux top command, we see a plenty of free memory (5 or
6GB), no matter how many jobs are running.
btpm complains also that it?s waiting for empty buffers.
Am I doing something wrong?
TIA
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