The ability to offload reporting
requests provides flexibility for reporting and queries and can help performance
on the primary server while making use of the standby server.
Emerging Technologies: Clusters Across a Distance
Some vendors are now offering clustering solutions that allow the nodes of the cluster
to be separated by enough distance to allow one node to survive the failure of the data
center that contains the other node. In fact, it is anticipated that many grid computing
deployments will occur this way in the future. The clustering of nodes separated by a
few kilometers is becoming possible using sophisticated interconnect technologies that
can function over greater distances. The disks are mirrored with a copy at each site to
allow each site to function in the event of a complete failure of the other site.
These solutions are intriguing because they can provide data server redundancy and
data center redundancy in a single solution. If one node (or the data center containing
it) fails, the node in the other data center provides failover.
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