Scott,

It will not cause you any trouble as cloning (it's also true
for staging) is reading from a volume and writing to another one,
each one requiring a proper device to have the volumes mounted 
(depending of your pool configuration).

The only effect you can see is performance degradation : if the source
is reading faster than the destination dev can write (or reverse), 
you can have well known "shoe-shine" effect and by consequences 
performance degradation.

For the rest, it's transparent for legato : cloning is not reading tape
block from source volume and writing the rode block as it on the target 
device. Networker cloning process is such than each source tape block
is demultiplexed to retrieve data from the SSIDs to be cloned
and then re-multiplex these extracted data by the writing device's 
associated nsrmmd before writing block on target tape.

How more your source volume is multiplexed ( I mean how many backups
have been written at the same time to the source volume), how more 
source tape will have to be processed to have the SSID data be 
retrieved, slowing down remultiplex process on target device.

Hope this helps,

Th



Kind regards - Bien cordialement - Vriendelijke groeten,

Thierry FAIDHERBE

HP Services - Storage Division
Tru64 Unix and Legato EBS Consultant
                                   
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-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
On Behalf Of Scott Russell
Sent: Friday, April 16, 2004 7:31 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Clone from LTO-2 to LTO-1

Greets.

I'm about to embark on my first major cloning exercise. As part of our
expanding our backup plans we'll be doing off site storage. It seems the
natural way to do this is to clone the save sets needed and then remove
those clone copies from the jukebox.

In reading over the cloning sections of the uxag.pdf I didn't see an
answer. Are there issues with cloning from LTO-2 to LTO-1 drives and
media? I don't _think_ it would be an issue since you can stage / clone
from disk to tape but better to ask someone who has more experience :)

Thanks for the help.

--
Scott Russell <lnxgeek AT us.ibm DOT com>
IBM Linux Technology Center

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