On Saturday 10 Jan 2009, narendra sisodiya wrote: > I was not aware of this , for a perfect HA backup system, what other > constraint we need to consider ?
The first thing you need for high availability is data sharing. If the applications permit it, you can have separate stores and application-level sync (e.g. replication in MySQL). If the application doesn't do sync by itself (e.g. mail), you need a highly available shared data store between the two servers. Ideally you would have some sort of NAS or SAN storage with multiple network paths, dual or triple power supplies and dual redundant RAID and disk controllers. Apart from the shared storage you need a heartbeat and address and process migration infrastructure. The Linux HA project provides these facilities IIRC. Regards, -- Raju -- Raj Mathur r...@kandalaya.org http://kandalaya.org/ GPG: 78D4 FC67 367F 40E2 0DD5 0FEF C968 D0EF CC68 D17F PsyTrance & Chill: http://schizoid.in/ || It is the mind that moves _______________________________________________ ilugd mailinglist -- ilugd@lists.linux-delhi.org http://frodo.hserus.net/mailman/listinfo/ilugd Archives at: http://news.gmane.org/gmane.user-groups.linux.delhi http://www.mail-archive.com/ilugd@lists.linux-delhi.org/
