> > >First off please go through the doc of Redhat cluster suite. Remember > >it is sold as RHEL Advanced Platform with considerably higher list > >price that "Standard" and you will need to buy two subscriptions as a > >HA cluster by definition consists of more than one node and a lot of > >redudndancy in just about every element in the stack -- be it active > >active or active passive. > > >Ok. having built and administered few HA RHCS, let me attempt to > >explain with my very little knowledge. > > >Clusters are used for different purposes. High Availability (HA), High > >performance computing (There is one in IITM - Check it out if you are > >allowed) > > >From your requirement it seems that you need HA cluster. > > >To ensure that the service does not go down if one of the member node > >dies. This can be active passive or active/active (lot of > >pre-conditions, ifs-buts in this case). > > >Please think as service as an NFS server/apache server/database > >server/terminal server (s/server/service/g) > > >Think of cluster as a phantom device (somewhat like Virtual IP) > >wherein the actual work is delegated the to one of its members. > > >Who delegates and how it is another subject in itself aka load > >balancing (Checkout Linux virtual server or LB devices) > > >Once a service is under control of cluster, none of the individual > >nodes can start it using /etc/init.d/<service> start. In fact it > >should never be. > > >Hope this intro is sufficient to whet your appetite. > > >If you have understood the above please revisit the earlier links by > >one of the very erudite members of this list. then come back with > >further questions. > > >I would suggest you use centos to experiment. No debian at this stage > >please. It will only confuse you. You will find a lot more people who > >have implemented multi-node Redhat clusters so the probability of > >getting answers is higher > > >And please note that *any* clustering is complex if you dont > >understand the underlying concepts. Administering and troubleshooting > >the cluster is non-trivial and requires a lot of time and effort > >investment. It is not simple as dong a partition/install packages. It > >requires more. >
Thank you sir for giving useful information, I m looking to build a cluster with very low cost, something like this http://helmer.sfe.se/ is there any alternative I can get in Cent OS same as what Redhat advance platform provide. Thank you regards subhojit ojha _______________________________________________ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
