I recently upgraded DP from 6.11 to 6.20. Since that day the debug.log has stopped the logging. The last message on the file is
4/23/2012 6:02:51 PM INET.7328.4724 ["/inet/inet_util.c $Rev: 14185 $ $Date:: 2010-10-25 12:38:42":764] A.06.20 bDPWIN_00512 DbgStack: DbgFcnOut() function does not match function on stack! ExitFcn="ExecuteUtilCommand", StackFcn="GetInstalledModules"
Function trace (currentLevel=1): Level 1: GetInstalledModules() Level 0: ExecuteUtilCommand()
"ExecuteUtilCommand" found on stack, adjusted level to 0 (one or more DbgFcnOut() calls missing)
No log entry in the debug.log is good. With 6.21 Data Protector starts logging a lot SessionMsgSize entries in debug.log, especially on media agents. You can accept this or ask HP support for the fix. I've the fix applied to my cells.
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I wanted the logs becase recently the cell manager stalled and was not writing any data to the tapes. I could not open the sessions in the GUI to see what was going on. The backup session that took 35 minutes to complete earlier took 6 hours to complete. The media server that wrote over 1TB data in 3 hours took 2 hours to write 30 GB of data.
I don't have a clue what happened. Once i restarted the cell everything went back to normal