[Building Sakai] sakai infrastructure configuration

[Bryan Holladay]

First suggestion is to update to Sakai 10.x instead, especially if you are
concerned about memory usage.  The memory footprint has been drastically
improved in the Sakai 10.0 release.  One great jira is
https://jira.sakaiproject.org/browse/SAK-25677

-Bryan


On Tue, Jul 29, 2014 at 2:20 AM, Sanghyun Jeon <euksa99 at gmail.com> wrote:

> Hello All,
>
> We regularly have about 2000 concurrent users and plan to move to Sakai
> 2.9.3 from Sakai 2.8 this Summer. We are running Sakai 2.8.x running 4 app
> nodes with one mysql database. One Apache front end server with 4GB memory
> is linked to two Sakai app servers with 8GB memory. Two tomcat app nodes
> are running on each Sakai app server. Each tomcat is currently configured
> as follows:
>
> -Xms1536m -Xmx3072m -XX:PermSize=256m -XX:MaxPermSize=512m
> -XX:NewSize=768m -XX:MaxNewSize=1024m -XX:+UseParallelOldGC
>
> While upgrading Sakai, we plan to reconfigure our infrastructure to
> improve throughput and accommodate our gradually increasing concurrent
> users (we expect 2,500 this Fall). I’ve heard that Sakai loves heap.
> However, I’ve also read that larger memory space means it takes the JVM
> longer to do garbage collections. I am wondering whether Sakai community
> experts can give me some guidance/advice on which one will be better: four
> 16GB tomcat servers (Plan A) or six 8GB tomcat servers (Plan B). Or would a
> totally different architecture be better, such as pairing an Apache with
> each and every tomcat? We’ll welcome any advice or suggestions.
>
>
>
>
> Current
>
> Plan A
>
> Plan B
>
>
>
> Sakai 2.8.x
>
> Tomcat 5
>
> jdk 6
>
> Mysql 5.1
>
> Sakai 2.9.3
>
> Tomcat 7.0.42
>
> jdk 1.7.0_40
>
> Mysql 5.5
>
> Sakai 2.9.3
>
> Tomcat 7.0.42
>
> jdk 1.7.0_40
>
> Mysql 5.5
>
> Apache server
>
> One 4GB and 2 cores
>
> One 16GB and 4 cores
>
> One 16GB and 4 cores
>
> Sakai db server
>
> One 8GB and 4 cores
>
> One 32GB and 4 cores
>
> One 32GB and 4 cores
>
> Sakai app server
>
> Two 8GB servers, two tomcats per serverà total four 4GB tomcat servers
>
>
>
> Two 32GB servers, two tomcats per server à total four 16GB tomcat servers
>
>
>
> Three 16GB servers, two tomcats per server à total six 8GB tomcat servers
>
>
>
> Setenv.sh
>
> -Xms1536m -Xmx3072m -XX:PermSize=256m -XX:MaxPermSize=512m
> -XX:NewSize=768m -XX:MaxNewSize=1024m -XX:+UseParallelOldGC
>
> -Xmx9g -XX:MaxPermSize=512m
>
>
>
> -Xmx6g -XX:MaxPermSize=512m
>
>
>
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