We had these kinds of problems.
1. Weblogic starts slow. ( OBIEE, Cloudcontrol and other wls ) approximely 10-15 minuts
2. JDBC Datasources hang in weblogic.
3. Degradation performance soa environments ( high cpu usage)
After executing Solution 1from the note
1) Download and install the following rpm: rng-utils-2.0-1.14.1.fc6.x86_
2) Startup the random generator as follows:
2) Startup the random generator as follows:
rngd -r /dev/urandom -o /dev/random -t 1
All our problems are history ;-)
So Quick startup of weblogic, no jdbc datasource hangs, good soa performance ( less cpu !)
See also
http://www.usn-it.de/index.php/2009/02/20/oracle-11g-jdbc-driver-hangs-blocked-by-devrandom-entropy-pool-empty/ :
Per your recommendation, I installed an older fan right above the server next to a microphone. This is opposed to new Dyson Air Multipliers. We all know that only the wind buffeting caused by the blades will truly engage a random pattern that will allow the entropy daemon to capture the wave patterns properly. By having a bad bearing the noise pattern although repeatable was just random enough to get the entropy daemon garbage cleanup done properly – but occasionally I still lost connections; especially to system 10G. So I then installed a parrot on top of the fan and had it fed my a datacenter troll (DCT – we call him Ed) at random times throughout the day. In effect when the parrot took a poop the random noise of the **** hitting the fan resolved all my connection issues. Including 10G!! You can imagine how happy my manager was to have the end of entrophy issues!! However, every now and then I walk into the data centre and he has the parrot on his shoulder pretending to be Captain Morgan. He’s always striking that silly pose with his foot on the barrel. To resolve this I put a honey badger in a parrot suit on top the fan – sure enough the random feedings stopped the random lost connections again. However, one day my manager came in with cuts all over his face. I asked him what the heck happened? He said he was making sure the **** hit the fan, but when it (the ****) looked different he was concerned for Polly (a fore mentioned parrot). When I told him it was really a honey badger we all had a good laugh, and to date we wonder at how when the **** hits the fan things work properly. Frankly when things hang we still ask “Is the **** hitting the fan?” Around here – most of the time it is. Thanks again for the help. Damn it Ed – what the hell are you doing go feed Polly. Geeze. I need to outsource him – slacker.
Met vriendelijke groeten,
Dik Pater
