> > You only need to "scanner -m", followed by "scanner -i", when the 
tapes
> > are not in the media database at all.
> 
> Since when?

Since when you have a saveset that spans multiple tapes. :-) You must 
populate the media db first, and then determine the order of the savesets, 
and then scan in that order.

> That's never been a requirement, and it's contrary to what the
> documentation says.  scanner -i rebuilds both, at once.

When a saveset does not span multiple tapes, yes, you are correct.

> I've certainly done scanner -i in the past and had it rebuild both.  If
> that's changed, I would love to know when it changed.  Someone should
> also get EMC to fix their documentation.

It is in the documentation ... it used to be p310 in the 7.4 Admin Guide 
...

If the save set is found on multiple volumes and the order in which the 
volumes
were written is unknown, complete this step. Otherwise, skip to Step 5.
a. On each volume that will be reintroduced into the online indexes, run 
this
command:
scanner -m device_name
The media database is updated with information from each volume.
Note: If the volume contains data from an earlier version of NetWorker, 
there may be
no pool information on the volume. In this case, the volume is considered 
to belong to
the Default pool. To assign the volume to another pool, use the -b 
pool_name option in
this step. If the volume already belongs to a pool, the -b option will 
have no effect.
b. Query the media database to determine the sequence in which the volumes
were written:
mminfo -a -v
In Step 5, the volumes must be reintroduced into the online indexes in the
same order in which they were written.
5. Starting with the first volume that was written, run the scanner 
program:
scanner -i device_name
The scanner program prompts for a new volume until you terminate it. Scan 
in
the remaining volumes in the order in which they were written.