pdb@SEI.CMU.EDU.UUCP (12/19/86)
I have a VMS BACKUP tape that was written with the /INTERCHANGE switch.
I'd like to recover the original directory structure, but BACKUP wants to
read all the files into the directory I specified on the BACKUP command.
That is, if I do:
BACKUP/REWIND/LOG MSA0: DUB0:[TAPE]
it reads all the files into the top-level directory [TAPE], instead of
creating them in sub-directories where they should be (and where BACKUP/LIST
says they originally were).
Does anyone have a better solution than creating all the sub-directories by
hand and moving the files into their appropriate directories? (There are
a *lot* of sub-directories to deal with!)
--Pat.dolson@ADA20.ISI.EDU (Douglas M. Olson) (12/20/86)
Try wildcarding the directory spec on your restore command, ie, BACKUP/REWIND/LOG MSA0: DUB0:[TAPE...] with other qualifiers as required. BACKUP only puts files where you tell it to put them... -------
carl@CITHEX.CALTECH.EDU (Carl J Lydick) (12/20/86)
The /INTERCHANGE is irrelevent to your problem. What you need to do is
use the command:
$ BACKUP/REWIND/LOG MSA0: DUB0:[*...]/OWNER=ORIGINAL
instead of
$ BACKUP/REWIND/LOG MSA0: DUB0:[TAPE]
The /OWNER=ORIGINAL is in case you want the files to belong to the original
owner instead of the person doing the backup.LEICHTER-JERRY@YALE.ARPA.UUCP (12/20/86)
I have a VMS BACKUP tape.... I'd like to recover the original directory
structure, but BACKUP wants to read all the files into the directory I
specified on the BACKUP command. That is, if I do:
BACKUP/REWIND/LOG MSA0: DUB0:[TAPE]
it reads all the files into the top-level directory [TAPE], instead of
creating them in sub-directories where they should be....
BACKUP is doing exactly what you asked it to do: By specifying a particular,
non-wildcarded directory in the output spec, you have asked that the files be
restored to that directory, and that directory only.
The correct output spec depends on exactly what you want to accomplish. If
you want the files to go back to EXACTLY the directories they came from, do:
1. BACKUP/REWIND/LOG MSA0: DUB0:[*...]
Alternatively, if you want to build a new directory structure under [TAPE]
that is similar to the original directory tree, do:
2. BACKUP/REWIND/LOG MSA0: DUB0:[TAPE...]
Then again, if you want to build a the directory structure under the current
default directory, you can do:
3. BACKUP/REWIND/LOG MSA0: DUB0:[...]
Method 1 has a problem previously discussed on this list: It requires R
access to the MFD (directory [000000]). Many systems provide only E access.
Suppose the files on the tape are in [LEICHTER...]. If I use form 2, they
end up in [TAPE.LEICHTER...]. That looks reasonable, but suppose I want to
put my own files back in my own directory tree. So I try:
2'. BACKUP/REWIND/LOG MSA0: DUB0:[LEICHTER...]
Now they end up in [LEICHTER.LEICHTER...]! (Compare to case 2.) The follow-
ing non-obvious command puts the files where they belong:
2''. BACKUP/REWIND/LOG MSA0:/SELECT:[LEICHTER...] DUB0:[LEICHTER...]
The reason for this is messy but clear when you understand it - which I did
once when it was explained to me, but have gotten fuzzy on. Let's see now.
Basically, BACKUP starts with an input and an output spec. It splits each
into a leading fixed part and a trailing wild part. It then tries to match
the parts up. The default input spec is [*...], which has a null fixed part
and [*...] as the wild part. In 2', the output has fixed part [LEICHTER],
wild part [...]. The null fixed part (i.e., "the root") matches [LEICHTER],
and the [*...] matches [...]. So a whole tree, starting with [.LEICHTER], is
built in [LEICHTER]. On the other hand, in 2'', the fixed input part is
[LEICHTER], which matches [LEICHTER], and one level of the directory spec
gets stripped off.
In general, it's easy to understand what BACKUP is doing when it is CREATING
a saveset; the confusion is on restoration, where it's not always obvious
what the input and output specs are. In fact, the same rules are followed
both ways - but it's been my experience that you have to experiment some times
to get exactly the effect you want.
-- Jerry
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