Another reason not to just randomly turn the /3GB switch on your 32-bit Windows machine
Tags :Domino 7 /3GB
We have a customer with enormous amounts of disk usage on single Domino servers. They started crashing recently. After numerous talks and escalations with Lotus, sending of crash files numerous times per day as this progressed, they finally stated the stunning line. Even though the IBM Performance Redbook for 7.0 talks about it, technotes (below #1233872 published this year) state it and IBM'ers have it in sessions, there is an underlying issue. For example, with Win32, the default memory available to each Domino partition is 2 GB. There is a switch to increase memory to 3 GB, but that solution has a performance impact of ~10% CPU utilization. With Windows 2003 x64 Edition and Domino 7.0.1, this switch will not be needed and 3 GB will be supported by default.
So the issue is that with large data stores (this is over 2TB we are talking right now), the /3GB switch causes crashes. While the internal IBM info is not published at this time, I hope it will show. The funny thing is that this exact issue affects Exchange shops too as shown in this posting. I found a warning on Ed's blog, under comment #8.
This led us to find out about the transaction logging issue with 7.0.1 so we are headed for 7.0.2 with no /3GB switch. Let's see if we can get that new technote.
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On Tuesday, March 20th, 2007 by Chris Miller
