To expand a little. I believe that a tape is
originally only read in a drive when the barcode
doesn't exist in media database.
As for location, as long as location is NOT a library
it's all good. NW knows that it's not present and when
you inventory there is a match in the media DB and NW
is satisfied.
When moving a drive or library to another storage
node, you change the name of the drive/library
(rd=...) which makes the previous location invalid.
But since the location listed with the tape is/used to
be valid NW gets confused and re-reads the tape.
Hmmmm... Maybe not so much "expand" as conclude...? :)
Anyone from Legato care to comment? ;)
// Matts
--- George Sinclair <George.Sinclair AT noaa DOT gov> skrev:
> I think your guess seems reasonable. I know from
> experience that in
> cases where the volume is no longer listed as being
> in a given library,
> e.g. it was previously removed and placed on shelf,
> NetWorker will not
> re-load it into the drive if you inventory it with
> bar coding turned on
> even though the library may have been moved. It
> appears that the only
> time it DOES re-load it is if it was previously
> listed in a given
> library and either the library has changed names or
> the drives, as you
> suggested, have changed. So, perhaps, tapes loaded
> in a given library
> are not simply seen by their bar codes but are
> additionaly seen by their
> bar codes at that particular location, not just one
> or the other, but
> both. So, until you remove the volume from the
> library, it's bar code to
> internal label matchup is volatile in the sense that
> it's bound to that
> location and will have to be re-loaded every time
> the location changes
> until it's removed from the library. At that point,
> it's golden.
>
> George
>
> Matts Nilsson wrote:
> >
> > Hi George,
> > I'm partially guessing here, so be patient with
> me.
> > What I know is that the tape will only be loaded
> in
> > drive if NetWorker can not match the barcode label
> to
> > a volume. That is, if the barcode is unknown, NW
> will
> > try to read the tape to see if it contains a
> label.
> > After that NW knows the status of the tape.
> >
> > Now I'm guessing: When you move a tape or
> > drive/library to a storage node, the tape isn't
> known
> > at that location. It is known in a library
> attached to
> > the NW server, but not at the storage node.
> > As I said, I'm guessing, so PLEASE correct me if
> I'm
> > wrong!! :)
> >
> > // Matts
> >
> > --- George Sinclair <George.Sinclair AT NOAA DOT GOV>
> skrev:
> > > Hi,
> > >
> > > I have a question about the bar code reader and
> how
> > > NetWorker determines
> > > if it has to re-load the volume to know what
> it's
> > > label is.
> > >
> > > I've noticed that if you have the bar code
> reader
> > > value turned on for
> > > the jukebox then NetWorker will only load the
> > > barcoded tape during an
> > > inventory the first time. After that, it no
> longer
> > > needs to load it to
> > > inventory it. Makes sense. It also makes sense
> that
> > > if you turn off the
> > > library, and or move tapes around then as long
> as
> > > the affected tapes
> > > have been previously inventoried, NetWorker
> should
> > > not have to re-load
> > > them to inventory them, BUT why is it that if
> you
> > > move the library to a
> > > different server then NetWorker has to re-load
> the
> > > tapes from scratch
> > > during the first inventory on that server, but
> once
> > > again, only the
> > > first time. This happens whenever we move the
> > > library to a new storage
> > > node server. Is this normal behavior? Maybe the
> fact
> > > that the SCSI
> > > cables were unhooked and the control port has
> > > changed causes this?
> > >
> > > Thanks.
> > >
> > > George
> > >
> > > --
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