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From "Robinson, Eric" <eric.robin...@psmnv.com>
Subject RE: placiing content and application on a microsoft DFS solution
Date Tue, 22 Jun 2010 21:10:26 GMT
 
> Has anyone ever placed an application and its content on a redundant 
> DFS solution?
> So as when one DFS server fails, another takes over.
> Does anyone see possible problems with this setup?
> ie. when dfs server fails does tomcat loose connection to the app or 
> is the failover fast enough.

DFS is based on the Windows Change Journal. There can be several seconds
to a minute of latency before file changes replicate from one DFS server
to the other. Be sure that your application could tolerate that. If I
was going to try a DFS-based approach, I'd just run DFS right on the
tomcat server(s). However, my experience with DFS has been
unsatifactory. Replication often drives up average disk queue lengths on
both servers and causes application-level freezes.

Personally, I'd strongly recommend using Linux+DRBD+Pacemaker. Much
faster and more stable.

--
Eric Robinson


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