Darren Dunham wrote:

Can someone explain the cloning process to me as to why it would be
more efficient to do a restore from a clone pool tape, and why this
would be a good idea to use the cloned tapes at a disaster recovery
test site to speed up things?

If you clone on a saveset-by-saveset basis, you demultiplex that
saveset and create a single chunk of data to read, leading to improved
restore performance (think of it as defragmenting your tape backups).
However, there's been recent discussion on this list which suggests
that there are ways in which the clone backup isn't demultiplexed, in
which case there would be little benefit apart from redundancy and
confirmed reliability.

Non-demultiplexed cloning happens if you pass multiple savesets into
nsrclone (instead of running them one at a time), and the savesets are
relatively multiplexed.  Demultiplexing the savesets takes more time
than straight cloning, so the time requirements may not allow you to do
that.

into nsrclone?

George

--
George Sinclair - NOAA/NESDIS/National Oceanographic Data Center
SSMC3 4th Floor Rm 4145       | Voice: (301) 713-3284 x210
1315 East West Highway        | Fax:   (301) 713-3301
Silver Spring, MD 20910-3282  | Web Site:  http://www.nodc.noaa.gov/

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