Re: [Networker] How to find a piece of a save set that spans?

Werth, Dave wrote:

Yes, I like slick too but sometimes when it's something you're only doing once 
or twice for testing purposes and don't need it on an ongoing basis then brute 
force methods are adequate.

I agree, but in this case, there's so many top level directories forsome of these save sets that it could take me an unacceptably long time.


Would the following scenario possibly work???:

Obviously, I can run 'mminfo' and have it tell me the size (sumsize) ofeach piece of the save set that's on each volume. Let's say there's fourpieces, and I specify something like 'sumsize(20)' to have it list itout in actual bytes. So what if I then run 'nsrinfo -s server -tnsavetime -v client' for the given save set and capture that to anoutput file. That will list all the pieces/parts in the save set, fileby file, with the 'NSR size' and 'file size' of each. Next, I write ascript to parse that output file and add up the sizes until it hitssomething close to the 'sumsize(20)' for the first volume. Once it hitsthat, it then prints out the pathname of that file. I then manuallycheck to see if that directory spans. If not, it's probably one of thedirectories just before or after that? I could then do this for thesecond piece and third piece. In this example, the fourth piece would bethe last so that would be moot.

Assuming this harebrained scheme would even work, I'm not sure what thedifference between 'NSR size' and 'file size' is, but 'NSR size' isalways a little bigger. Maybe I would want to use 'NSR size' for this?Also, is the order that 'nsrinfo' lists everything in the same as theorder that the data was actually backed up? If not, this goofy methodwon't work.


Maybe there's a better way (sigh ...).

George


Dave Werth
Garmin AT, Inc.
Salem, Oregon

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On 
Behalf Of George Sinclair
Sent: Wednesday, October 06, 2010 3:31 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] How to find a piece of a save set that spans?

Werth, Dave wrote:

George,

I don't know about how you can determine ahead of time what directories will span 
multiple volumes but you can certainly go into Recover and select a directory to recover 
then check the "Show required volumes" display to see if in fact it does span 
volumes.  I don't imagine it would take too long to find one that did (but then what do I 
know?).

Yes, that's exactly what I'm looking for: a way to determine whichdirectories did in fact span tapes, NOT which ones will span tapes. So,this is an "after the fact" question. I can certainly do as youmentioned but was looking for a slick way to determine this withouttrial and error?

Some of the save sets have a small number of top level sub-directoriesso it won't take too long to find one that spans, but most of the savesets have a lot of top level sub-directories, so that will take muchlonger. Obviously, at least one of them must span two tapes.


George

Dave Werth
Garmin AT, Inc.
Salem, Oregon
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On 
Behalf Of George Sinclair
Sent: Wednesday, October 06, 2010 3:08 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] How to find a piece of a save set that spans?

Hi,

We have 19 save sets that we've just backed up. These have also been
cloned. Each of these save sets is 1+ TB and consist of a number of
smaller sized sub-directories, e.g. 300 KB, 2.4 GB, 19 GB, etc. The tape
pool is indexed. All of these save sets span multiple tapes (minimally
3-4 tapes) as they were multiplexed together (parallelism=4) during backup.

I'd like to run a browseable recover test (nwrecover or CLI recover) on
   a couple of random sub-directories from each save set, but I'd like
to also pick a few that span at least two tapes. I don't want to recover
the whole save set, however, as these are all very large.

Is there a way I can determine which directories span two tapes?

Will I have to just select random directories, using nwrecover or CLI
recover, until I find one that shows two volumes required?

Thanks.

George

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