If you care about clustering and currently use VMware, you should read Wim Coekaerts' blog about vCenter Server Heartbeat and Oracle VM Manager with Oracle Clusterware... I was gonna look into Oracle VM (and Xen) later this year anyway, but may move it up because of this.
Just found a great tip to prevent timeouts of PuTTY sessions. I'm fine with timeouts by the host, but in our case the firewall kills sessions after 30 minutes of inactivity... When using PuTTY to ssh to your Linux/Unix servers, be sure to use the feature to send NULL packets to prevent a timeout. I've set it to once every 900 seconds, i.e. 15 minutes... See screenshot on the right.
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