LOCKSS: A Permanent Web Publishing and Access SystemList of TopicsSlide 3IntroductionSlide 5Specific NeedsSlide 7SolutionSlide 9Overview of LOCKSSSlide 11Data FlowSlide 13LOCKSS – Web CachesSlide 15LOCKSS - 3 perspectivesReader’s PerspectiveLibrarian’s PerspectivePublisher’s PerspectiveSlide 20LOCKSS – Content PreservationSlide 22Detecting and Repairing DamageHow it works?Slide 25Slide 26Hampering the "Bad Guy"Slide 28Project Status - Alpha TestProject Status – Beta TestSlide 31ConclusionReferences3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation11LOCKSS: A Permanent LOCKSS: A Permanent Web Publishing and Web Publishing and Access SystemAccess SystemV. Reich & D. S. H. RosenthalV. Reich & D. S. H. Rosenthal Presented ByRoopa D. VegesnaGraduate Student3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation22List of TopicsList of TopicsIntroductionIntroductionSpecific NeedsSpecific NeedsSolutionSolutionLOCKSS OverviewLOCKSS OverviewData FlowData FlowWeb CachesWeb Caches3 Perspectives3 PerspectivesContent PreservationContent PreservationDetecting and Repairing DamageDetecting and Repairing DamageHampering the “Bad Guy”Hampering the “Bad Guy”Project Status Project Status ConclusionConclusion3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation33List of TopicsList of TopicsIntroductionIntroductionSpecific NeedsSpecific NeedsSolutionSolutionLOCKSS OverviewLOCKSS OverviewData FlowData FlowWeb CachesWeb Caches3 Perspectives3 PerspectivesContent PreservationContent PreservationDetecting and Repairing DamageDetecting and Repairing DamageHampering the “Bad Guy”Hampering the “Bad Guy”Project Status Project Status ConclusionConclusion3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation44IntroductionIntroductionFor centuries libraries and publishers For centuries libraries and publishers have stable roles.have stable roles.–PublishersPublishers produced information. produced information.–LibrariesLibraries provided access to this provided access to this information. information. Problems:Problems:–BuildingBuilding digital collections. digital collections.–AccessAccess to future generations. to future generations.–Publishers asked to assure Publishers asked to assure persistency.persistency.3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation55List of TopicsList of TopicsIntroductionIntroductionSpecific Needs Specific Needs SolutionSolutionLOCKSS OverviewLOCKSS OverviewData FlowData FlowWeb CachesWeb Caches3 Perspectives3 PerspectivesContent PreservationContent PreservationDetecting and Repairing DamageDetecting and Repairing DamageHampering the “Bad Guy”Hampering the “Bad Guy”Project Status Project Status ConclusionConclusion3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation66Specific NeedsSpecific NeedsFuture generations of Future generations of scientistsscientists need need access to this literature for research, access to this literature for research, teaching, and learning. teaching, and learning. Current and future Current and future librarianslibrarians need an need an inexpensive, robust mechanism, which inexpensive, robust mechanism, which they control, to ensure their communities they control, to ensure their communities maintain long-term access to this essential maintain long-term access to this essential literature.literature.Current and future Current and future publisherspublishers need need assurances that their journals' editorial assurances that their journals' editorial values and brands will be available only to values and brands will be available only to authorized and authenticated readers.authorized and authenticated readers.3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation77List of TopicsList of TopicsIntroductionIntroductionSpecific Needs Specific Needs SolutionSolutionLOCKSS OverviewLOCKSS OverviewData FlowData FlowWeb CachesWeb Caches3 Perspectives3 PerspectivesContent PreservationContent PreservationDetecting and Repairing DamageDetecting and Repairing DamageHampering the “Bad Guy”Hampering the “Bad Guy”Project Status Project Status ConclusionConclusion3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation88SolutionSolutionTechnically, any solution must satisfy Technically, any solution must satisfy three requirements:three requirements:–The The contentcontent must be preserved as bits. must be preserved as bits. –AccessAccess to the bits must be preserved. to the bits must be preserved.–The The abilityability to parse and understand the to parse and understand the bits must be preserved.bits must be preserved.The above issues are addressed by The above issues are addressed by –LLots ots OOf f CCopies opies KKeep eep SStuff tuff SSafe (LOCKSS)afe (LOCKSS)3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation99List of TopicsList of TopicsIntroductionIntroductionSpecific NeedsSpecific NeedsSolutionSolutionLOCKSS OverviewLOCKSS OverviewData FlowData FlowWeb CachesWeb Caches3 Perspectives3 PerspectivesContent PreservationContent PreservationDetecting and Repairing DamageDetecting and Repairing DamageHampering the “Bad Guy”Hampering the “Bad Guy”Project Status Project Status ConclusionConclusion3/17/20053/17/2005CS 791/891 Digital PreservationCS 791/891 Digital Preservation1010Overview of LOCKSSOverview of LOCKSSLOCKSS is LOCKSS is open source, peer-to-peeropen source, peer-to-peer software that software that functions as a persistent access preservation functions as a persistent access preservation system.system.LOCKSS allows libraries to run LOCKSS allows libraries to run web cachesweb caches for for specific journals.specific journals.LOCKSS is a digital preservation Internet appliance, LOCKSS is a digital preservation Internet appliance, notnot an archivean archive..A key A key differencedifference between LOCKSS and "general between LOCKSS and "general library collections" is that the action of preserving library collections" is that the action of preserving material in the collection is intertwined with the material in the