Auspex File System Traces

These traces follow the NFS activity of 236 clients serviced by an Auspex file server over the period of 1 week during late 1993. They were gathered by Cliff Mather by snooping Ethernet packets on four subnets. The clients are the desktop workstations of the University of California at Berkeley Computer Science Division.

Each entry is of the form
  • -timestamp- -type- -action- FID: -fid- OFF: -offset- SIZE: -size- HOST: -host-


  • -timestamp- is a floating point number indicating the time of the record (in seconds)
  • -type- is one of Attr, Block, Dir, Delete, Open, Close.
    • Attr records indicate a getattr request.
    • Block or Dir records indicate that a file block or directory was read or written over the network.
    • Delete records indicate that the file was deleted.
    • Open and close records indicate that a file was opened or closed. (These records exist for non-directory files only.)
  • -action- is one of READ, WRITE
  • -fid- is a file identifier (16-digit hex number)
  • -offset- is the offset within the file for a read or write or the (approximate) size of the file for Open or Close
  • -host- is the id of the client that made the request

Note that since the trace was gathered by snooping the network, the Open and Close events were generated heurstically from the observed pattern of reads, writes, and attribute requests. See Matt Blaze's paper "NFS Tracing by Passive Network Monitoring" Winter 1992 USENIX pp. 333-344.

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