According to the Command Reference Manual for AFS 3.3, the default number of
  V files in a disk cache is the greater of one of the following:
  
        - 100
        - cachesize/chunksize * 1.5
                (390,000/64 * 1.5 = 9,140)
          - cachesize/10,000 
                  (390,000/10,000 = 39)

That should be cachesize/10 = 39,000.

Number of Vfiles is unrelated to volume table size.  128 seems like a
minimum for -volumes.

  If we go with the 9,140 and each V file contains 64K, this 
  would exceed the 430MB of available disk space by 141 MB!

Vfiles times chunksize has to exceed cache size, or you'll never fill your
cache.  Average Vfile size will be around 10-20 K, regardless of chunk size,
because most user files aren't any bigger than that, and a Vfile can only
contain a single user file.

Let me know how it goes.

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