-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Its true tht Nfs provides shared storage. However, the reason I can't use Nfs is because if say my server goes down, there goes the shared filesystem. That is, assuming that Nfs has no mechanism of mirroring parts/entire filesystems on different machines. In other words, one modification on one server instantly beghins to proppogate to the rest of the machines. The best sollution I have found thus far is http://nbd.sourceforge.net for what I am looking for. However, it seems its not ready for production use. On Wed, Mar 24, 2004 at 10:18:59PM +0000, Garry Turkington wrote: > Hi, > > If you're basically building a high-volume web farm then don't reinvent > the wheel and use standard deployment architectures. Having the content > on a NFS server behind the web servers is an attractive and potentially > low cost route, even gigabit networking is relatively affordable these > days. If fully shared storage is *truly* what you need then NFS is the > easiest option. > > Also, think about the likely data access patterns. Do you have large > amounts of static content? If so then this could be local on each server, > leaving only the truly dynamic content requiring the shared storage. That > likely allows you to get away with a less beefy NFS server and back-end > network. > > I'd also ask you to take a very long hard look at the stated requirement > for instantaneous synchronisation across the multiple servers. Building a > highly available web service is exceptionally difficult if the requirement > list includes phrases such as instantaneous, "fully transparent" and "no > single points of failure". What you really need to understand is the > implication of the possible failure scenarios and just what impact that > will have on the service clients. Often when cost and complexity are > taken into account the requirements soften somewhat. Otherwise you end up > designing systems where you want to have users in pairs in case one > spontaneously combusts. You can push points of failure further up and > downstream but at some point you have to accept some risk. > > Regards, > Garry > > Garry Turkington > garry.turkington at acm.org > > > _______________________________________________ > Speakup mailing list > Speakup at braille.uwo.ca > http://speech.braille.uwo.ca/mailman/listinfo/speakup -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFAYg2ONohoaf1zXJMRAoupAKCluI6ZzAxJfpY1awTK7Rev92iaxACeJ12f o8Mwgypo4ltAP+Tp4hSAm4E= =L17S -----END PGP SIGNATURE-----
