[jboss-dev-forums] [Design of JBoss Collaboration Server] - Re: JBMS Alternate Datastore

[sappenin]

It looks like Sequoia will not only do load balancing & failover (i.e, if one database cluster goes down, the others will pick up), but it also does database distribution/replication:

anonymous wrote : The database is distributed and replicated among several nodes and Sequoia balances the queries among these nodes

Assuming you don't need a HUGE amount of database storage (i.e., you can do with an amount of storage limited by a given server, say 3 500GB hard drives per box), then the storage here would seem to be pretty redundant.  Imagine 3 database boxes, each with 1500GB of storage.  The database would be replicated across the 3 database servers (using Sequoia), and if one database box goes down, Sequoia just doesn't redirect database requests to the dead box anymore.

Of course, if one were thinking of opening a webmail service where millions of users were granted 2GB of mail storage each, then such a solution would not scale.  Instead, a SAN would probably be a better bet for storage redundancy/availability, and expansion.



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