I have a client with a cluster of two ASG220s. Initially, they were on V6, and we ran the two units side-by-side on different T1s. One box rarely ran above 0.2 and the other almost never got over 1. The sun shown brightly.
For the first 11 months they were clustered, the high volume of spam that was being saved in the quarantine caused the cluster to be pegged at 100% most of the time. Most days, the average was over 98%. Occasionally, we would have to reboot just to be able to start email flowing again and allow people to access the internet. Those were dark days.
V7.300 was the renaissance for their cluster because the new SMTP proxy knew how to reject and blackhole most of the spam. Unfortunately, there appears to have been a glitch in the 7.202-to--7.300 upgrade. In order to keep the cluster functioning now, we've had to disable IPS. With IPS running, it was often pegged at 100% and caused problems with some (not even most!) 'delivered' emails getting stuck in the cluster instead of going to their exchange server.
SO, here's the question:
Has anyone with an active/active cluster seen that it is faster than a single, stand-alone unit? If so, I would like to know about it. I don't know if we have a hardware malfunction or not.
Thanks - Bob
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