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Domino Addressing Capabilities

Posted on 2007-07-26
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It is my understanding that previous versions of Domino (WIN32) could only address up to 2GB RAM and 2 CPUs.

Does Domino 7 or 8 still have these limitations for Win32?

Full points for links to IBM documentation.
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Question by:Bill-Hanson
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by:SysExpert
ID: 19576549
From the R8 Beta doc - readme.nsf

Supported operating system versions
Microsoft Windows 2003 Server Standard Edition; Microsoft Windows 2003
Server Enterprise Edition; Microsoft Windows 2003
Server x64 Edition, so it does support 64 bit Windows if you want more RAM/ CPUs

I hope this helps !
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by:Bill-Hanson
ID: 19576577
Right, I read that too.  But I don't see where it lists the upper limits for addressing ram and CPUs.  I need these specs for R7 and R8 for sizing purposes.
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by:Bill-Hanson
ID: 19576595
So it looks like the upper limit for RAM is still 3GB, but only if you use the switch.

Anyone know how many processors R7 can address?
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by:Sjef Bosman
Sjef Bosman earned 664 total points
ID: 19578254
I came across a presentation once, I suppose it's the one mentioned on this website:
http://www.windelen.be/windelen/wwwindelen.nsf/(all)/005BBA9D56A7D8BFC12571EE00350829?OpenDocument

A link to the Lotusphere presentation, ID111 - Tuning Memory Usage on Your IBM Lotus Domino Server:
http://www-10.lotus.com/ldd/sandbox.nsf/af0f1b4673fc2715852570ff006cd3ff/cb533a62695b1f08852571370053fa43?OpenDocument

No mention of R8 though...
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by:qwaletee
qwaletee earned 664 total points
ID: 19580039
R6 and R7, both being only 32-bit, can address 2GB of RAM.  you can get 3GB by playing with boot.ini switches, but Lotus actually recommends against it, because they;ve found that frequently, this causes the OS to slow down because it has less space to, umm, manage memory management.  You can get something over 2GB with tweaks.

Domino 8 (coming next month) has both 32-bit and 64-bit versions.  The 32-bit version will behave much like D6 and D7.  The 64-bit removes the limitations.

*****HOWEVER***** You CAN actually get more memory TODAY if you run 32-bit Domino on a 64-bit OS.  That's because the OS can address more than 4GB, so it doe snot have to reserve ANY of the 32-bit address space for its own purposes.  That means you can get 4GB of memory dedicated to applications... though, due to Windows parameterization, I think you still have a max of 3GB.

As to number of processors, I have to dig it out, but I'm pretty sure I saw some benachmarks showing that there's no perofrmance advantage to more than 8 cores, which would be foru dual-core processors or two quad-core processors.  I don't know if the same will apply in D8, whether 32-bit or 64-bit.
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by:Bill-Hanson
ID: 19581602
Ok, I think I'm good on the memory.  Now I just need to get a handle on the CPUs.

Currently, we are using 2 CPUs (actually, the machine has 8 CPUs , but we partitioned the server into 4 instances with VMware - 2 CPUs each).

I was under the impression that Domino could only use 2 CPUs , but it sounds like Domino is capable of using all 8 CPUs if we made them available.  Is this true of Domino 6 as well?

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by:qwaletee
ID: 19582725
Yes, Domino will use all CPUs, partially by accident.  That's because Domino runs many processes, and the OS will assign the processes and their threads CPU slices on any available CPU.  OS does favor keeping a codestream on a single processor somewhat, but there's enough in Domino thread and process management to strill take good advantage of the extra processors.

Also note that since you are using VM Ware, you can have some VM/CPU mapping if you want to tweak CPU usage a bit. With VM Ware, if you are running multiple VMs, it pays to have more processors, even if within a VM< you are running apps that don't take advantage of multiple processors.
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