19 May
2005
19 May
'05
10:27 a.m.
Yes, Andy Goldstein (or whoever, but I think Andy wrote the first
version) really did a nice job in VMS BACKUP. I once wrote a program
to read such tapes on a Unix system and needed to learn the
techniques used. Very nice. Indeed an entire /BLOCK_SIZE block of
data within one /GROUP_SIZE could be completely corrupted on tape,
yet BACKUP could correctly restore it.
John
--
Do you still have this (I assume it's different from the various C
versions of "VMSBACKUP"
floating around)
That program does not do a very good job of recovering from archive
errors.
There appears to be very little written down about the variations in
the VMS Backup
format as well.