Networker

Re: [Networker] Cloning question

2006-04-06 02:52:35
Subject: Re: [Networker] Cloning question
From: Peter Viertel <Peter.Viertel AT MACQUARIE DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Thu, 6 Apr 2006 16:51:18 +1000
Cloning always results in un-multiplexed tapes, so it is usually much
faster to clone from a clone tape than an original which has multiplexed
savesets on it. Eg if you had 4 savesets backing up at once to a tape,
then cloning each of those savesets from the original tape takes 4x
longer to read than cloning from a cloned copy, and this may then be too
slow for the destination drive, and you get shoe-shining if the data
isnt all that compressible.

I cant see any downside to cloning from a clone either...

Also, I would use a second clone pool as it helps make sure that you
don't send both clone copies of a saveset off to the same remote
location.

-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT listserv.temple DOT edu]
On Behalf Of George Sinclair
Sent: Thursday, 6 April 2006 6:17 AM
To: NETWORKER AT listserv.temple DOT edu
Subject: [Networker] Cloning question

Hi,

I have a bunch of save sets on a clone volume that I'd like to clone a
second time. Cloning it to the same clone pool is fine by me. Is it
better to clone from the original tapes, or is cloning from the clone
volume OK? One advantage of cloning from the clone volume is that in
some cases, the originals might be elsewhere whereas the clones may be
the only thing here on site. Also, there are some original save sets
that spanned multiple volumes but were cloned to one clone volume so
that would reduce the required tapes. Just trying to get a feel for the
recommended approach. Seems cloning from the clone might be a quick
solution in some cases.

We're running an older 6.x release, and it's my understanding that
NetWorker would want to mount all the original volumes to clone the save
set or all the clone volumes as the case may be, but apparently in 7.x
you can have it clone just the piece that's on the given tape? Is it
safe to assume that if NetWorker wants all the volumes that the saveset
spanned then this will also be true if cloning from a clone, e.g if the
clone saveset spanned multiple clone volumes?

Thanks.

George

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