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Clustered Computing

Robert Tompkins. Clustered Computing. Topics discussed . Define parallel computing Paradigms and purposes High availability PVM/MPI Mosix Beowulf 2 NFS Lustre. Paradigms and purposes. Clustered computing serves different purpose, and uses different software to accomplish that goal

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Clustered Computing

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  1. Robert Tompkins Clustered Computing

  2. Topics discussed • Define parallel computing • Paradigms and purposes • High availability • PVM/MPI • Mosix • Beowulf 2 • NFS • Lustre

  3. Paradigms and purposes • Clustered computing serves different purpose, and uses different software to accomplish that goal • High availability for systems that need to be up 99.99% of the time • High performance for scientific computing • High demand/workload for webservers and databases

  4. High availability Redhat and heartbeats • Sometimes it is important to have a machine running 99.99% of the time • Redhat and other HA distributions allow you to have two or more machines doing the exact same transactions • When one system goes down, the backup system detects it and automatically takes over its ip address and transactions continue

  5. PVM/MPI • Parallel Virtual Machine shares the memory and cpu across all of the nodes • MPI starts a process on each of the nodes that can communicate with all of other other nodes, similar multithreaded programming

  6. Mosix • Mosix allows you to migrate a process from one machine to another • The entire memory space is moved from one machine to another • Processes can migrate to machines that are least used

  7. Beowulf 2 • Beowulf 2 is a reimplementation of Beowulf with Lightweight kernels • This allows more of the processor to be used • Also decrease the management requirements and required resources • The machine only needs memory and a cpu

  8. NFS/LUSTRE • All clusters need a shared file system • Originally most used NFS or AFS to mount the home directories • PVFS was an attempt to distribute writes across the nodes, the same as raid 0 and raid 1 • Lustre is a commercial/freeware filesystem that does raid 0,1,5 and drastically increases the write and read speeds

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