If you're running linux vm's that do not run X I think you're main issue will be enough RAM but if you've got enough you should be fine. I'm definitely no expert in VMs but I think they are CPU intensive only if you're running a GUI desktop, so if you're not using Windows to run your servers you should be okay.
I guess the reason I suggest running multiple VMs is you may get better memory management but I'm really only speculating an am definitely no expert. I guess the question lies in whether the memory limits are a result of the OS or Java and I'd be leaning towards Java as it appears the Java VM that is reporting the memory error and not the OS. Therefore, if you split up your DSpace installs into VMs you would be able to overcome Java's limitations. Alternatively, you could load up the machine with more memory if possible. I could ask one of my sysadmins if you require more information. cachiusa wrote: > Hi Havercamp, > Thanks a lot for your reply. But more VM will take more resources and be > more expensive in CPU, rite? I just have 1 server for all (DNS, mail, web > hosting, ...) > Best, > Cachiusa > > Mr Havercamp wrote: > >> Maybe splitting the load using virtual machines may help. Instead of >> running 24 dspace instances on one machine, use something like 2 virtual >> machines with 12 instances on each or 4 and 6, 3 and 8, etc. >> >> cachiusa wrote: >> >>> Dear all, >>> I am looking for solution for 24 Dspace for 24 communities run on 1 >>> server. >>> Which solution I should choose: >>> >>> 1) 24 instances of Tomcat, one for each Dspace instance, or >>> 2) One Tomcat for 24 Dspace instances. >>> >>> I choose second solution by following the link >>> http://www.nabble.com/Changing-DB-Name-%C2%BFhow--td19053520.html >>> and already finished installation. But my server is broken if I try to >>> access 24 DSpace at the same time (it is ok to open 12 Dspace). >>> >>> Some sites show error: >>> java.lang.OutOfMemoryError: PermGen space >>> >>> The others return errors: >>> java.io.FileNotFoundException: >>> /usr/local/gmseenet/partners/gmseenet/dspace/webapps/jspui/WEB-INF/web.xml >>> (Too many open files) >>> >>> or: >>> org.apache.jasper.JasperException: Unable to compile class for JSP >>> >>> I already set heap memory for Tomcat to 2048 by >>> JAVA_OPTS="-Xmx2048M -Xms64M -Dfile.encoding=UTF-8", but I still face the >>> same problem. >>> >>> I have to run 24 DSpace in 1 machine, so what is solution for me? >>> Please help me. Thanks in advance. >>> Best, >>> Cachiusa >>> >>> >>> Robin Taylor-2 wrote: >>> >>> >>>> Hi Mika, >>>> >>>> For what it is worth, we currently run 5 Dspace instances in the same >>>> Tomcat >>>> without any problems. Using Tomcat manager allows us to >>>> stop/start/deploy >>>> one instance without affecting the others. We are running on a >>>> Sun/Solaris >>>> v240. We run an Apache Webserver in front of Tomcat to avoid the user >>>> having to append 8080 to the URL. We allocate 2G of memory to Tomcat, my >>>> understanding is that Tomcat doesn't like having more although that may >>>> be >>>> just a vicious rumour. We did investigate the possibility of separating >>>> the >>>> Dspace's into different virtual machines or into different instances of >>>> Tomcat on the same machine, but came to the conclusion that we would be >>>> introducing a layer of complexity and increased maintenance for no real >>>> gain. >>>> >>>> Cheers, Robin. >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> The University of Edinburgh is a charitable body, registered in >>>> Scotland, with registration number SC005336. >>>> >>>> >>>> -----Original Message----- >>>> From: [EMAIL PROTECTED] >>>> [mailto:[EMAIL PROTECTED] On Behalf Of Mika >>>> Stenberg >>>> Sent: 08 April 2008 12:38 >>>> To: '[email protected]' >>>> Subject: [Dspace-tech] Hardware used in DSpace repositories >>>> >>>> We are planning to centralize all DSpace instances used in our >>>> University >>>> into one server. Eventually a total of 5-6 individual DSpace instances >>>> would >>>> end up running on the same platform, either on virtualized OS's or >>>> simply >>>> distributed on different ports. >>>> >>>> What I'd be interested in, is to learn the your experiences on the issue >>>> and >>>> acquire the following info from other members of the community: >>>> >>>> 1) How many instances of DSpace does your institution run and >>>> what kind of hardware (CPU, memory, disk space & OS) are they >>>> running on? >>>> >>>> 2) How many items are stored in your repository? >>>> >>>> 3) Have you experienced any performance issues with your >>>> repositories using the hardware described above? >>>> >>>> >>>> You can reply directly to me by e-mail at mika.stenberg(at)helsinki.fi. >>>> If other parties are interested on summary, I will be happy to provide >>>> it. >>>> >>>> Thanks for the input, >>>> >>>> Mika Stenberg >>>> University of Helsinki >>>> Finland >>>> >>>> ------------------------------------------------------------------------- >>>> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >>>> Register >>>> now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use >>>> priority code J8TLD2. >>>> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javao >>>> ne >>>> _______________________________________________ >>>> DSpace-tech mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/dspace-tech >>>> >>>> >>>> >>>> ------------------------------------------------------------------------- >>>> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >>>> Don't miss this year's exciting event. There's still time to save $100. >>>> Use priority code J8TL2D2. >>>> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >>>> _______________________________________________ >>>> DSpace-tech mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/dspace-tech >>>> >>>> >>>> >>>> >>> >>> >> ------------------------------------------------------------------------- >> This SF.Net email is sponsored by the Moblin Your Move Developer's >> challenge >> Build the coolest Linux based applications with Moblin SDK & win great >> prizes >> Grand prize is a trip for two to an Open Source event anywhere in the >> world >> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >> _______________________________________________ >> DSpace-tech mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/dspace-tech >> >> >> > > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ DSpace-tech mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dspace-tech
