plagued by IOError: [Errno 0]?

[Bill Janssen]

I'm running a server that periodically, and unpredictably, keeps
getting an IOError when opening a file.  But the Errno is 0!  What
does this mean, and how can I get rid of it?

I'm running on a Solaris 2.6 SPARC system, and the files being opened
are relatively large (3.4 MB) on NFS-mounted file systems.  Python 1.5.2.

IOError: [Errno 0] Error: '/docRepository/NewRepoDoc/1'

I'm doing an "open(fname, 'r')".

Bill