Single System Image Clustering

Source ex.pl?node_id=38692&lastnode_id=131 ex.pl?node_id=38692&lastnode_id=131

Types of Clusters High Performance (HP) High Performance (HP) –Beowulf Load-leveling Load-leveling Web-service Web-service Storage Storage Database Database High Availability (HA) High Availability (HA)

Characteristics Constructed from standard computers, or nodes without any shared physical memory Constructed from standard computers, or nodes without any shared physical memory There is an OS running on each node There is an OS running on each node

Purpose HA (High Availability) HA (High Availability) HP (High Performance) HP (High Performance) Parallel processing Parallel processing Parallel web servicing Parallel web servicing

High Performance Clusters Constructed to run parallel programs such as weather simulations and data mining Constructed to run parallel programs such as weather simulations and data mining A master node typically drives the cluster A master node typically drives the cluster

Load Leveling Clusters Constructed to allow a user on one node to spread his/her workload transparently across multiple nodes Constructed to allow a user on one node to spread his/her workload transparently across multiple nodes Designed for computationally intensive long running jobs that are not massively parallel Designed for computationally intensive long running jobs that are not massively parallel

Web-service Clusters Load-leveling requests to a web site Load-leveling requests to a web site Often referred to as a farm, however technology is developing that will allow increased clustering capacity Often referred to as a farm, however technology is developing that will allow increased clustering capacity See the Linux Virtual Server (LVS) project See the Linux Virtual Server (LVS) project

Storage Clusters Supply parallel highly available access to filesystem data Supply parallel highly available access to filesystem data

Database Clusters Provide parallel and HA access to a database Provide parallel and HA access to a database Oracle Parallel Server (OPS) Oracle Parallel Server (OPS)

High Availability Clusters Often known as failover clusters Often known as failover clusters When a failure is detected scripts are used to fail over IP addresses When a failure is detected scripts are used to fail over IP addresses

SSI???

NASA Example Mark Twain said everybody talks about the weather, but nobody does anything about it. Well, NASA is trying to by installing a 1,024- processor SGI Origin 3800 supercomputer at the NASA Ames Research Center in Moffet Field, Calif. Silicon Graphics says the machine, which will be used to predict climate patterns, is the Mark Twain said everybody talks about the weather, but nobody does anything about it. Well, NASA is trying to by installing a 1,024- processor SGI Origin 3800 supercomputer at the NASA Ames Research Center in Moffet Field, Calif. Silicon Graphics says the machine, which will be used to predict climate patterns, is the

NASA Example Cont. largest single-system image computer in the world. "We have improved our ability to simulate climate by a factor of 10," said Bill Feiereisen, chief of the NASA Advanced Supercomputing facility, in a statement. largest single-system image computer in the world. "We have improved our ability to simulate climate by a factor of 10," said Bill Feiereisen, chief of the NASA Advanced Supercomputing facility, in a statement. Source - InformationWeek BetweenTheLines 11/20/2001