Hi John, I am a little out of my depth here so forgive me if I am taking rubbish, but I am not sure that having two servers constantly available is the right solution for you. Typically this setup would be used to spread the load if the application is in high demand. To provide high availability in the event of failure you would typically use some clustering software which will failover of IP addresses etc from the failed machine to another machine which sits idle ready to be used in the event of a failover. I just did a quick google on 'Centos clustering' and this came up http://www.linuxtopia.org/online_books/centos_linux_guides/centos_cluster_configuration_and_management/. I don't know if its free or if there are any free alternatives.
Cheers, Robin. Robin Taylor Main Library University of Edinburgh Tel. 0131 6515208 > -----Original Message----- > From: John Preston [mailto:[email protected]] > Sent: 20 April 2009 00:16 > To: [email protected] > Subject: [Dspace-tech] High Availability DSpace > > I have to set up a DSpace instance and want to make it highly > avalable. Its not that the load is gonna be that heavy to > start with, but I want to have some redundancy such that if a > machine goes bad, the system will still function while I look > about changing it out. So I'm planning on using LVS on Centos. > > I will have two routers which will keep traffic going to two > webservers on the backend which have duplicate DSpace > instances. Now to have duplicate instances I will use a > common NFS store for the assest store, but for the database I > will point each of the DSpace instances to a common database > on the network. I know this will be a single point of > failure, but I can either restore the database quickly if I > need, or I can get synchronisation across postgres databases > dynamically if I want (slony, etc). > > My question is: can anyone give me a simpler or better way to > achieve high availability, and is DSpace code able to manage > different web applications writing to the database across > different instances. > > John > > > > -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. ------------------------------------------------------------------------------ Stay on top of everything new and different, both inside and around Java (TM) technology - register by April 22, and save $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. 300 plus technical and hands-on sessions. Register today. Use priority code J9JMT32. http://p.sf.net/sfu/p _______________________________________________ DSpace-tech mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dspace-tech
