Okay, I just answered my own question, and unfortunately, it's the ugly
answer. DB2 gets very upset if you do a RESTORE DB ... CONTINUE and all the
files are not there. When it runs out of data, it does not politely ask
that you point it to the location of the next file, it simply says:

SQL2538N  Unexpected End of File of Backup Image reached on media "<backup
filename>"
There is no known way to resume the restore once this error occurs.

Therefore, it appears that there must be enough space for all the
destination tablespaces and all of the backup files at the same time, but
those backup files can be compressed and read through a named pipe that
uncompresses them on the fly (suggested by Dimitry). Because NFS shares are
a very hot political topic in my shop, I did not try the option of mounting
a remote share that contained all the files, but one would think that
approach should work (albeit slowly).

Thanks,

Fred

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