Architecture
PVFS consists of 4 main components, and a number of utility programs. The components are the PVFS2-server, the pvfslib, the PVFS-client-core, and the PVFS kernel module. Utilities include the karma management tool, utilities such as pvfs-ping, pvfs-ls, pvfs-cp, etc. that all operate directly on the file system without using the kernel module (primarily for maintenance and testing). Another key design point is the PVFS protocol which describes the messages passed between client and server, though this is not strictly a component.
Read more about this topic: Parallel Virtual File System
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