[Info-vax] Backup verify problems

[SMS]

gsdguy wrote:

> Can someone explain what is going on? How can I get rid of these
> verify errors? Thank you.

   Can someone explain _where_ it's happening?  (VMS version,
ECOs, hardware type, ...)  You, perhaps?

   My guess is that the errors are in blocks which are past the
End-Of-File point.  DIRE /SIZE = ALL.  DIFFERENCES stops when
it gets to EOF, but BACKUP doesn't, so BACKUP complains, but
DIFFERENCES doesn't.  I believe that it's fairly common for an
indexed file (DIRE /FULL, look for "File organization:
Indexed, [...]") to have blocks allocated past the (claimed)
EOF.

   If there's a good way to avoid the complaints, I don't know
of it.  Perhaps moving the restored backup copy into the place
of the original would do it.  BACKUP might zero-fill the
past-EOF blocks/bytes, so it might agree better with its own
output than it would with the original file.  (Assuming that
the data past EOF have no actual value, of course.  Save
everything, I always say.)

--------------------------------------------------------

   Steven M. Schweda               sms at antinode-info
   382 South Warwick Street        (+1) 651-699-9818
   Saint Paul  MN  55105-2547