I discovered our four node cluster running on RedHat EL5, Ocfs2 1.2.6 and
Oracle 10.2.0.3 have memory leak. I suspect ocfs2, but I could be wrong. I
suspect ocfs2 because when we run RMAN backup the free memory goes from 8 GB
down to 200 MB. When I umount the ocfs2 backupdisk after the backup is
finished, the memory is released again.
I want to test it some more and found a script to test writing to the disk.
This script contains a command saying "echo 3 > /proc/sys/vm/drop_caches". Is
this a safe command to run in production? Meaning the cluster and oracle
database is running. Or should I run the "sync" command pre to this command? Or
should I never run this command in a production environment? I'm afraid that
this command will free up memory not written to disk yet. And therefore I would
get into trouble in my production environment. The script I want to test looks
like this and is captured from this mailing list:
------
#!/bin/bash
dd if=/dev/urandom of=/tmp/file bs=1024 count=75
COUNT2=`cat /tmp/COUNT2`
COUNT1=0
DIR1=$(printf "%03d" $COUNT2)
mkdir /data/$DIR1
while [ "$COUNT1" -lt 101 ]
do
cp -v /tmp/file /data/$DIR1/file.$COUNT1
(( COUNT1++ ))
done
(( COUNT2++ ))
echo $COUNT2 > /tmp/COUNT2
------
I then executed it as follows:
while [ true ] ; \
do /root/bin/populateocfs2.sh ; echo 3 > /proc/sys/vm/drop_caches ;
sleep 2 ; \
vmstat |tail -n 1 >> /root/tmp/sysstats.txt ; done
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