Client Server Systems

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By James J. Kistler

This e-book is predicated at the author's PhD thesis which was once chosen throughout the 1993 ACM Doctoral Dissertation festival as one of many 3 top submissions.
The concentration of this paintings is at the factor of availability in disbursed dossier structures. It offers the $64000 new strategy referred to as disconnected operation, during which consumers masks disasters and voluntary community detachments by means of emulating the performance of servers the place real server-oriented strategies are insufficient. this allows consumer operation even less than whole isolation from the server; the fresh integration of cellular pcs into the approach is a vital side-effect of the recent method. The layout and implementation of disconnected dossier carrier in a operating method, the Coda dossier approach, is defined in detail.

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The implementations of the mechanisms are somewhat different, however, reflecting the fundamental distinction between clients and servers in the A F S / C o d a model. Most of the rest of this section discusses issues common to both mechanisms, and the term "replica" need not be qualified by server or client (or first- or second-class). 4 is the only place where rationale specific to one mechanism - disconnected operation - is given. Replica control in Coda is optimized for availability, scalability, and performance.

The rights array in a C o d a vnode is precisely the object's access vector, and it is consulted for protection-checking purposes rather than the owner, group, and mode attributes. Similarly,protection changes are accomplished via the setrights transaction rather than by the chown and clmod transactions} 1 11 The actual implementation of access vectors is via access-controllists (acls) rather than MAXUID-size arrays. 3 PartitionedReplica Control 35 If the traditional Unix attributes are irrelevant for protection in Coda, then w h y do they stillappear in the vnode and w h y are there stilltransactions for manipulating them?

Mount points are represented as special symbolic links, whose contents are the name of the target volume and whose mode bits are a reserved value. Venus recognizes m o u n t points during name resolution and crosses t h e m automatically. This scheme ensures name transparency, since the composition of volumes is determined globally by state in the file system itself, rather than locally by actions taken at each client (as with the NFS mount mechanism, for example). Volumes are pivotal to location as well as n a m e transparency.

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