Cooperative Computing - Department of Computer Science and 协同计算计算机科学系.pptVIP

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Cooperative Computing - Department of Computer Science and 协同计算计算机科学系.ppt

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Cooperative Computing - Department of Computer Science and 协同计算计算机科学系.ppt

Tactical Storage:Simple, Secure, and SemanticAccess to Remote Data Prof. Douglas Thain University of Notre Dame /~dthain Plentiful Computing Power As of 25 April 2006... Condor Worldwide: 56,682 CPUs / ??? TB / 1758 sites Teragrid 15,328 CPUs / 220 TB / 6 sites Open Science Grid 21,156 CPUs / 83 TB / 61 sites EGEE Grid Lots??? Complex Ecology of Storage Problems Accessing Data Large Burden on the User User may not be able/willing to state files in advance. Different services/protocols available at different sites. Programs not modified to take advantage of services. Different access modes for different purposes. File transfer: preparing system for intended use. File system: access to data for running jobs. Resources go unused. Disks on each node of a cluster. Unorganized resources in a department/lab. Would like to combine disks into larger structures. A global file system can’t satisfy everyone! (Global means different things to different people.) Both a technical and social problem. What’s the Problem? We often assume that the site administrator is responsible for making the site comfortable for the user. (Not possible on the grid!) Rather, the user should be able to bring along a mechanism to access multiple independent (remote?) data sources. Of course, we have to make it easy! Tactical Storage Systems (TSS) A TSS allows any node to serve as a file server or as a file system client. All components can be deployed without special privileges – but with security. Users can build up complex structures. Filesystems, databases, caches, ... Admins need not know/care about larger structures. Two Independent Concepts: Resources – The raw storage to be used. Abstractions – The organization of storage. Key Properties Tactical Storage is Simple: Appears as an ordinary filesystem. Applies to unmodified applications and data w/out code changes, relinking, kernel modules, etc... Tactical Storage is Secure: Authentication with standard GSI or Kerberos. Rich distributed acc