[Info-vax] Problems restoring image-backup

[Stephen Hoffman]

On 2016-06-28 19:35:44 +0000, David Froble said:

> My understanding is in an /IMAGE restore that all volume info comes 
> from the save set.

Nope.  Some contents change.

> Perhaps this is not correct?

Ayup.   It's not correct.

> If not, then I'd consider it a bug.

You can consider it a bug, but it's how the Itanium boot environment 
necessarily works, particularly with the hack-around that exists here 
for the lack of partitioning support within OpenVMS I64, as the EFI 
console requires the disk to be partitioned.   But it's also how the 
VAX and Alpha environments necessarily work with BACKUP, too.   The 
console bootstrap-related data structures involved here contain 
pointers to sectors.  With BACKUP /IMAGE, those sectors inherently 
change, which means that BACKUP can't slam in the old contents and 
boot.  On all three architectures, the boot structures are mapped to 
files.  Those file contents cannot be completely restored unmodified; 
the sector pointers have to change.

If you want a pristine restoration, maybe consider BACKUP /PHYSICAL or 
dd or such; a sector-oriented copy.


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