> Cloning does not imply second backup run - it is volume-to-volume
copy.
In fact, automated cloning is performed by save set and if a save set
starts on tape1 and spans tapes 2, 3, & 4, then NetWorker will change
tapes until the save set has reached completion. However, one can clone
by volume, but automatic cloning is by save set. So the time it takes
the Autochanger to swap out tapes will also be a factor in the cloning
operation, especially if a save set spans 5 -6 tapes.
If you choose to clone manually you then have the option of cloning by
either save set or volume.
This is how it is in version 6.1.1, I'm not certain how it functions on
in later versions.
Cheers,
Carter Fowler
Hardware Service Technician
The City Of London
380 Wellington St. Suite 600
London, ON, CA, N6A 5B5
Off. 519.661.5711
Cel. 519.870.4956
E-mail. cfowler AT london DOT ca
-----Original Message-----
From: Yura Pismerov [mailto:ypismerov AT TUCOWS DOT COM]
Sent: April 16, 2003 7:24 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: Running savesets simultaneously?
George Sinclair wrote:
>
> Hi,
>
> What's the best way to back up the same saveset to two different tapes
> simultaneously? Can this be done and if so, what is the best way?
>
> Let's say I have a client that has 10 directories. I want to back up
> each of these as a separate path (saveset) to a tape, maybe like 4 at
a
> time since my sessions per device is currently set to 4. I then want
to
The number of the target sessions does not mean it is limited it.
It only means that after number of sessions for the group reaches the
threshold Networker will try to allocate another device for the new
sessions.
After all the drives "filled up" evenly it starts load balancing (kind
of) so all the drivers that are enabled for the pool have the same
number of sessions.
Total number is limited by either server parallelism or group
parallelism (that takes precedence if it has non-zero value).
> create a second copy of these on another tape. I was considering
> cloning, but this seems not to be the best choice in this case, so I
was
> thinking rather than backing everything up once to one tape and then
> repeating the process for the next tape, I would instead do it to both
Cloning does not imply second backup run - it is volume-to-volume copy.
> tapes at the same time and finish in half the time. My client
> parallelism is typically set to 4 on most of the clients.
>
> Would it be possible for the client to send four save sessions to two
> different devices? Maybe a client cannot back up the same session to
> more than one device at a time? Not sure, never tried.
I think you will have to set up a separate group for it with the same
schedule, but bound to different pool. So it will be 2 save sessions
running for the same save set.
Considering network performance, it might be feasible to review cloning
option.
Also keep in mind that speed of the cloning is limited only by speed of
your tape drives only.
>
> Thanks.
>
> George
>
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