||Oracle Tips by Burleson
10g Grid Computing
Real Application Cluster Architecture
The cluster interconnect is a high bandwidth,
low latency communication facility that connects each node to other
nodes in the cluster and routes messages among the nodes. It is a
key component in building the RAC system.
In case of RAC database, the cluster
interconnect is used for the following high-level functions:
Monitoring Health, Status, and Synchronize
Transporting lock management or resource
Moving the Cache Buffers (data blocks) from
node to node.
High performance database computing involves
distributing the processing across an array of cluster nodes. It
requires that the cluster interconnect provide high-data rates and
low-latency communication between node processes.
Interconnect technology that is employed
connecting RAC Nodes should be scalable to handle the amount of
traffic generated by the cache synchronization mechanism (which is
directly related to the amount of contention created by the
application). The more inter-instance updates and inter-instance
transfers, the more message traffic it generates. It is advisable to
implement the highest bandwidth, lowest latency interconnect that is
available for a given platform.
The volume of synchronization traffic directly
impacts the bandwidth requirement, and messaging delays are highly
dependant on the IPC protocol. The interconnect is not something
that you should risk having under configured, assuming scalability
is a key objective.
Oracle recommends that for Linux environments
the interconnect bandwidth is of 1GB Ethernet, use the UDP as IPC
protocol in preference to TCP. 10g has extended support for emerging
technologies like Infiniband, which will greatly improve
interconnect scalability (and standardization) for large numbers of
nodes, as well as provide a choice of interconnects under Linux.
The above text is
an excerpt from:
Oracle 10g Grid & Real Application
Computing with RAC
by Mike Ault, Madhu Tumma
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