Re: Collapsing a bound volume set

From: AEF (spamsink2001_at_yahoo.com)
Date: 07/29/05 

Date: 28 Jul 2005 15:25:39 -0700

Phillip Helbig---remove CLOTHES to reply wrote:
> In article <42E92AB4.5ABAA9B8@teksavvy.com>, JF Mezei
> <jfmezei.spamnot@teksavvy.com> writes:
> > Martin Vorlaender wrote:
> > > Sorry, but no. I have been trying to BACKUP/IMAGE an old volume set to a
> > > shiny new MSA-1000 partition just recently, and BACKUP refused to work:
> > > you can only make an image copy to the same number of disks as are in
> > > the volume set.
> >
> > Interesting. Doesn't a bound volume set appear as a single drive to VMS ? Or
> > is there an indexf.sys for every physical volume ?
>
> The latter. In fact, there are all the .SYS files. At the user level,
> yes, it appears as a single drive, but one can access the members
> individually with sufficient privileges.
>
> > Could you BACKUP/IMAGE to a save set, and then restore that saveset to the
> > MSA-1000 drive ?
> >
> > Not using /IMAGE means that when you have alias directories, you end up having
> > truly multiple copies of files, as opposed to the same file being copied over
> > itself multiple times (unless you use /NOLALIAS in which case, you only have
> > one copy operation per file).
>
> Yes. Hopefully, if using /IMAGE, then the setting of /ALIAS is
> irrelevant (and it should be an error if /ALIAS or /NOALIAS is
> specified), since with an image backup neither ignoring alias entries
> nor having multiple copies of the file are acceptable; one should have
> copies of the aliases. Perhaps /NOALIAS would be more appropriate here,
> since presumably the directories (where the information is stored) will
> be copied properly, and the backup itself will see that the file is
> already there if it tries to copy it again.
>
> The HELP is confusing, frightening, and differs for different versions
> of VMS.

Frightening? No. Confusing, yes. But I think the bottom line is to use
/NOALIAS except when restoring from pre-/ALIAS-BACKUP save sets. I
would guess that you could just not use any alias qualifier for V7 and
up. I know for v6.2 there is a small difference between the default and
using /NOALIAS. I get a few extra copies of a few aliased files when I
don't include /NOALIAS. I assume that's fixed in some later version.

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