- Clustering involves connecting multiple independent systems together to achieve reliability, scalability, and availability. The systems appear as a single machine to external users. - There are different types of clustering including high performance computing (HPC), batch processing, and high availability (HA). HPC focuses on performance for parallelizable applications. Batch processing distributes jobs like rendering frames. HA aims to provide continuous availability. - Achieving high availability involves techniques like heartbeat monitoring, failover configurations, shared storage, and RAID configurations to ensure redundancy in the event of failures.

1. Clusters Paul Krzyzanowski [email_address] [email_address] Distributed Systems Except as otherwise noted, the content of this presentation is licensed under the Creative Commons Attribution 2.5 License.

6. we don’t get all that (yet) (at least not in one package)

8. High Performance Computing (HPC)

19. Batch Processing

27. Load Balancing for the web

35. Software load balancer www.mysite.com

36. Software load balancer www.mysite.com src=bobby, dest=www03

37. Software load balancer www.mysite.com response src=bobby, dest=www03

41. High Availability (HA)

42. High availability (HA) Class Level Annual Downtime Continuous 100% 0 Six nines (carrier class switches) 99.9999% 30 seconds Fault Tolerant (carrier-class servers) 99.999% 5 minutes Fault Resilient 99.99% 53 minutes High Availability 99.9% 8.3 hours Normal availability 99-99.5% 44-87 hours

47. Clusters Architectural models

57. Achieving High Availability heartbeat 2 heartbeat 3 Server A Server B Fibre channel switch Fibre channel switch Fabric A Fabric B Storage Area Networks Local Area Networks switch B switch A heartbeat

58. Achieving High Availability heartbeat 2 heartbeat 3 Server A Server B Ethernet switch A’ Ethernet switch B’ ethernet A ethernet B Local Area Networks (for iSCSI) Local Area Networks switch B Switch A heartbeat

65. The end