EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU> wrote on
04/10/2008 12:19:24 PM:
> On Thu, Apr 10, 2008 at 12:07:58PM -0400, MIchael Leone wrote:
> > Huh. So ... let's use a specific example ... I have an EOM tape from
> > 2007-04-30. Well beyond browse time, but I do see it in the media
> > database, and it is listing what savesets are on the tape. So,
presuming I
> > know which specific file of a saveset I want, I should be able to do a
> > restore by doing a "Saveset Recover", and choosing the 2007-04-30
saveset
> > (even tho that is well past the retention period).
>
> Yes.
>
> > And no "nsrck -L7" needed, no "scanner -i", no scanner -m"? Just have
the
> > tape in the library, and rock-n-roll? :-) Or would I still need
"scanner
> > -i" (yes, because I need to re-scan in the individual files in the
> > saveset?).
>
> Right. I was mentioning 'scanner -m' earlier, which deals with the
> media database. The File database is different. After the browse time
> expires, the file indexes are purged from the database. So to do a file
> recovery (not a saveset recovery), you'd need those indexes.
>
> If the client is still active, but you need the older indexes, the two
> most common ways to merge them in would be 'nsrck -L7' to read an older
> save of the indexes, or 'scanner -i' to recreate the indexes from the
> saveset on tape.
OK! So when the volume is in the database, but is beyond the browse time,
I need to do a "scanner -i", because I *don't* save the indexes on tape
with the job, if I want to get a specific file. This re-creates the
listing of all the files in the savesets that are on the tape.
If I *did* have the indexes on tape, I could do a "nsrck -L7", and NW
would get the listing of files in the savesets on tape from the tape
itself (it would prompt me to load the tape as necessary, I presume?)
> > So when WOULD I need the "scanner -i" or "scanner -m", then? I'm back
to
> > being really confused ... would I need to do "scanner -m" on a tape
volume
> > that I do *not* see in the media database?
>
> Correct. That could be foreign media (never used by this networker
> server), or perhaps an odd situation where the volume was manually
> removed from the database before it was recycled.
AH! Yes, I have a tape here that was apparently created by NW, but is
*not* in the media database. I guess somebody inadvertently deleted the
volume from the media database (before my time; this tape is from about 6
months before I started here). This presumes that there's an index on
tape? Or does that not matter?
> > Or "scanner -i"? And would I then need "nsrck -L7"? (probably not)
>
> Those two both attempt to get to a similar goal of placing certain file
> indexes into the online catalog from tape. The methods are different,
> but you wouldn't normally use both commands. (And in most situations,
> 'nsrck -L7' will be faster if it is available).
>
> The subtle point is that after the browse period expires, Networker
> removes the file indexes for that saveset from disk. (They tend to take
> up a lot of space).
AH HA! There's a point I was previously unaware of (Consciously, anyway).
> After the retention period expires, the the volume is eligible to be
> selected for recycling, but the media database continues to track the
> savesets.
Describes all of my month-ends ... all say "recyclable". And since I don't
save indexes on tape, I need to "scanner -i" them, when I want to recover
files from them. NOW I think I'm getting it ...
> Only at recycle time will Networker automatically purge the
> saveset information for that volume.
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