Disconnected Operation in a Distributed File System by James J. Kistler

By James J. Kistler

This publication is predicated at the author's PhD thesis which was once chosen through the 1993 ACM Doctoral Dissertation festival as one of many 3 most sensible submissions.
The concentration of this paintings is at the factor of availability in dispensed dossier structures. It provides the $64000 new strategy referred to as disconnected operation, during which consumers masks disasters and voluntary community detachments by way of emulating the performance of servers the place genuine server-oriented recommendations are insufficient. this enables shopper operation even below entire isolation from the server; the fresh integration of cellular desktops into the process is a crucial side-effect of the hot method. The layout and implementation of disconnected dossier carrier in a operating process, the Coda dossier approach, is defined in detail.

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Hence, a user m a y protect his or her own d a t a by using only "clean" workstations, but this responsibility is his or her own and not that of the system at large. 2 System administration. A central operations staff can focus effort and resources on the relatively small number of servers, and delegate responsibility In reality, even a careful AFS user is vulnerable to network attacks which intercept or modify unencrypted data packets. Encryption is an option of the system, but it is typically not enabled for data packets because software encryption is too slow and hardware encryption is too expensive.

Locally, it results in better performance, as average latency decreases due to accesses which hit in the cache. Globally, it results in better scalability, as more clients can be supported by each server. The AFS cache manager, Venus, intercepts file system calls made on Vice objects and services them locally whenever possible. When necessary, it communicates with servers in Vice using a remote procedure call (RPC) interface. The following characteristics are central to the client-caching architecture of AFS: - whole files are transferred and cached rather than individual blocks.

Perform a control function on the specified object. Make a hard link to the specified file. Move the read/write pointer for the specified descriptor. Make a directory with the specified path. Make a block or character device node with the specified path. Mount the specified F-desystem on the specified directory. Open the specified file for reading or writing, or create a new F-de. Read input from the specified descriptor. Read contents of the specified symbolic link. Change the name of the specified object.

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