On 08/19/2011 05:31 PM, solarflow99 wrote: > I see, it just makes me wonder a few things. Can HA cluster load > balance traffic on each node? I didn't see anything about that, most > clusters would want to have other nodes busy serving requests. Or is it > supposed to work like this: use LVS to load balance to the app servers, > and use HA cluster for shared NFS storage? I can't see how something > like a database can read and write like crazy like this without > performance problems. > > Thanks,
"Cluster" simply means "two or more servers working together". Nothing more. Now that said, load-balancing is a very common form performance clustering, and they inherently offer a degree of high availability. That is am implementation choice though, above and beyond the cluster foundation itself. Consider; Another common cluster is one that hosts high-availability virtual servers. If you have only one VM, then the second node is sitting there doing nothing. This is still very much a valid cluster. Another example would be an HA SAN with a floating IP. The backup is just sitting there, effectively doing nothing, but again, this is a perfectly valid cluster. You need to make a mental separation between the cluster foundation and the cluster resources. They work intimately together, but they are fundamentally separate components. -- Digimer E-Mail: [email protected] Freenode handle: digimer Papers and Projects: http://alteeve.com Node Assassin: http://nodeassassin.org "At what point did we forget that the Space Shuttle was, essentially, a program that strapped human beings to an explosion and tried to stab through the sky with fire and math?" _______________________________________________ rhelv6-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv6-list
