Hi Matt, You should allocate what is needed. So measure what your application needs. A rule of thumb is hard to give since, indeed, it depends. Our DB2connect is sized at 300M. And from measuring the guest we can see that we could size it down to even 250M. We still don't size down since it is still in test. After our stresstest we can decide if 300M is a good value or that is needs to be adjusted, either more or less storage. That would depend on the number of concurrent connections, to name one. Obviously when you are running a full database 300M can be too small. But then again, measure what your application needs. Our webserver is sized at 200M, we have guests running as small as 130M.
Ask how they came up with 6G. Was it the recommendation from the books? Was it due to the prior observation that with 6G the linux machine didn't use swap? And did they try the same with 5G or 4G? Do they know how much the application is actually using? What are your intentions beyond this guest? Do you want to add more guests? Then try to start with small machines. IMHO it is very hard to size down afterwards since nobody wants to size down, they only want to size up. Also, don't mix different workloads into one machine. In VM it is very easy to add a new server instead of consolidating into one guest. And your performance will benefit since different workloads usually require different settings, both for the guests and the application. Regards, berry. -----Original Message----- From: Linux on 390 Port [mailto:[email protected]] On Behalf Of Dazzo, Matt Sent: donderdag 2 december 2010 15:46 To: [email protected] Subject: Memory Allocation We are entering the world of zvm/linux with a z10bc-2098 n04 and 16gb total memory. I am trying to decided what to allocate to zvm/linux as a starting point. Our initial thoughts and a recommendation from our VAR was 6gb. The first application will be DB2 Conn Server and not sure what's after that. I'd like to find out how much memory other shops have allocated and what applications they support. Is our initial 6gb a decent starting point? I know the IBM standard answer 'it depends' but I am looking for some clarity and guide lines. Thanks Matt ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
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