Re: [Networker] 2 Part Question
2007-05-15 12:46:43
>> 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.
--
Darren Dunham ddunham AT taos DOT com
Senior Technical Consultant TAOS http://www.taos.com/
Got some Dr Pepper? San Francisco, CA bay area
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