I'm guessing you're multiplexing your Exchange backups with other
backups.  Automatic cloning is cloning only the Exchange backup, where
as volume cloning is cloning everything on that volume.  So when you're
cloning just Exchange, you're reading all the data on the tape, but
throwing into the bit bucket anything that isn't Exchange.

The other respondent who says his speed is the same probably isn't
multiplexing Exchange backups with other backups.

---
W. Curtis Preston
Backup Blog @ www.backupcentral.com
VP Data Protection, GlassHouse Technologies 

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Browning, David
Sent: Wednesday, July 25, 2007 8:50 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] New to clones - performance?

I've been dealing with Networker for more than 9 years now, but have
never had to deal with clone issues.   With the recent addition of
storage nodes and dedicated storage nodes, we now have the time to run
clones - something we never had the time to do before. 

If I manually clone an Exchange volume via the GUI, it runs in about 2
hours (give or take a few).   If I set the Exchange Group to
automatically clone, once the backups finish, it runs extremely slow -
in fact the past 2 days, after about 8 hours of cloning, it had finished
only 1 tape, and was working on tape 2.   

If I manually clone, I could get all 5 Exchange tapes cloned much
quicker than having it done automatically - do I have something
configure wrong, or is this just the way Networker works? 

FYI - LTO-3 tapes, about 2.5 - 2.6 TB of Exchange data. 

David M. Browning Jr.
LSUHSC Enterprise Network Operations/Help Desk

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