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Could you please have a look at Ibtech’s problem?
 
Deamon spools its output to a file called chordiant/chroot/log/SPI_MAIN_CMDPROD.log –this works. Backup cron job cat /dev/nulls the file and after that deamon cannot write back to the same file. Why is that?
[chnadm@chprdapp01]:/chordiant/chroot/log>ls -rlt *MAIN*
-rw-r--r--    1 chnadm   chnadm           48 Jul 18 13:00 SPI_MAIN_CMDPROD.130718.log.gz
-rw-r--r--    1 chnadm   chnadm           48 Jul 19 13:00 SPI_MAIN_CMDPROD.130719.log.gz
-rw-r--r--    1 chnadm   chnadm           48 Jul 20 13:00 SPI_MAIN_CMDPROD.130720.log.gz
-rw-r--r--    1 chnadm   chnadm           48 Jul 21 13:00 SPI_MAIN_CMDPROD.130721.log.gz
-rw-r--r--    1 chnadm   chnadm           48 Jul 22 13:00 SPI_MAIN_CMDPROD.130722.log.gz
-rw-r--r--    1 chnadm   chnadm           48 Jul 23 13:00 SPI_MAIN_CMDPROD.130723.log.gz
-rw-r--r--    1 chnadm   chnadm           48 Jul 24 13:00 SPI_MAIN_CMDPROD.130724.log.gz
-rw-rw-rw-    1 chnadm   chnadm            0 Jul 25 13:00 SPI_MAIN_CMDPROD.log
-rw-r--r--    1 chnadm   chnadm           48 Jul 25 13:00 SPI_MAIN_CMDPROD.130725.log.gz
 
 
[chnadm@chprdapp01]:/chordiant/chroot/log>crontab -l
#chordiant log cleaner
00 13 * * * /usr/local/fbUNIX/clean/chordiant_clean.sh >/dev/null
 
more /usr/local/fbUNIX/clean/chordiant_clean.sh
#!/bin/ksh
 
if [ -f /chordiant/chroot/log/AuditSystem.log ]
then
        cp /chordiant/chroot/log/AuditSystem.log /chordiant/chroot/log/AuditSystem.$(date +%y%m%d).log
        cat /dev/null >  /chordiant/chroot/log/AuditSystem.log
        chmod 666 /chordiant/chroot/log/AuditSystem.log
        chown chnadm.chnadm /chordiant/chroot/log/AuditSystem.log
        gzip /chordiant/chroot/log/AuditSystem.$(date +%y%m%d).log
fi
 
if [ -f /chordiant/chroot/log/SPI_MAIN_CMDPROD.log ]
then
        cp /chordiant/chroot/log/SPI_MAIN_CMDPROD.log /chordiant/chroot/log/SPI_MAIN_CMDPROD.$(date +%y%m%d).log
        cat /dev/null >  /chordiant/chroot/log/SPI_MAIN_CMDPROD.log
        chmod 666 /chordiant/chroot/log/SPI_MAIN_CMDPROD.log
        chown chnadm.chnadm /chordiant/chroot/log/SPI_MAIN_CMDPROD.log
        gzip /chordiant/chroot/log/SPI_MAIN_CMDPROD.$(date +%y%m%d).log
fi
 
if [ -f /chordiant/chroot/log/LockProcess.log ]
then
        cp /chordiant/chroot/log/LockProcess.log /chordiant/chroot/log/LockProcess.$(date +%y%m%d).log
        cat /dev/null >  /chordiant/chroot/log/LockProcess.log
        chmod 666 /chordiant/chroot/log/LockProcess.log
        chown chnadm.chnadm /chordiant/chroot/log/LockProcess.log
        gzip /chordiant/chroot/log/LockProcess.$(date +%y%m%d).log
fi
 
if [ -f /chordiant/chroot/log/JavaActivator.log ]
then
        cp /chordiant/chroot/log/JavaActivator.log /chordiant/chroot/log/JavaActivator.$(date +%y%m%d).log
        cat /dev/null >  /chordiant/chroot/log/JavaActivator.log
        chmod 666 /chordiant/chroot/log/JavaActivator.log
        chown chnadm.chnadm /chordiant/chroot/log/JavaActivator.log
        gzip /chordiant/chroot/log/JavaActivator.$(date +%y%m%d).log
fi

Is it possible your chown syntax is simply wrong?

chown chnadm.chnadm /chordiant/chroot/log/AuditSystem.log

Shouldn't that be: (With a colon not a period between user/group)
chown chnadm:chnadm /chordiant/chroot/log/AuditSystem.log

Also you may want to do a fuser on the file and record that output...

fuser /chordiant/chroot/log/AuditSystem.log

on the file before starting to manipulate it?

Try inserting this line


cat /dev/null >  /chordiant/chroot/log/AuditSystem.log
sleep 10                                                                                            <------
chmod 666 /chordiant/chroot/log/AuditSystem.log


See if that makes any difference. It will suspend processing for 10 seconds, hopefully to allow the emptying of the log file to complete.