Nfs1

DESIGN AND IMPLEMENTATION OF THE SUN NETWORK FILESYSTEM R. Sandberg, D. Goldberg S. Kleinman, D. Walsh, R. Lyon Sun Microsystems

What is NFS? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Paper highlights ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Objectives (I) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Objectives (II) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Basic design ,[object Object],[object Object],[object Object],[object Object]

The protocol (I) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Advantages of statelessness ,[object Object],[object Object],[object Object],[object Object]

Consequences of statelessness ,[object Object],[object Object],[object Object],[object Object],[object Object]

The lookup call (I) ,[object Object],[object Object],[object Object],[object Object],[object Object]

The lookup call (II) ,[object Object],[object Object],[object Object],[object Object]

The lookup call (III) ,[object Object],[object Object],[object Object]

Server side (I) ,[object Object],[object Object],[object Object]

Server side (II) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Client side (I) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Remote mount Client tree bin usr / Server subtree rmount After rmount, root of server subtree can be accessed as /usr

Client side (II) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Client side (III) UNIX system calls VNODE/VFS Other FS NFS UNIX FS User interface is unchanged RPC/XDR disk LAN Common interface

File consistency issues ,[object Object],[object Object],[object Object]

Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Server x’ x x’’ A B Inconsistent updates

UNIX file access semantics (I) ,[object Object],[object Object],[object Object],[object Object]

UNIX file access semantics (II) ,[object Object],[object Object],[object Object],[object Object],[object Object]

NFS solution (I) ,[object Object],[object Object],[object Object],[object Object],[object Object]

NFS solution (II) Server x’ x A B Better to propagate my updates and refresh my cache ? ?

Implementation ,[object Object],[object Object],[object Object],[object Object]

Hard issues (I) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Hard issues (II) ,[object Object],[object Object],[object Object],[object Object]

Hard issues (III) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Hard issues (IV) ,[object Object],[object Object]

Tuning (I) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tuning (II) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tuning (III) These three improvements had the biggest impact on NFS performance

My conclusion ,[object Object],[object Object],[object Object],[object Object],In addition, NFS was able to evolve and incorporate concepts such as close-to-open consistency (see next paper)

Nfs1

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