Say you have 20 savesets that are multiplexed (4 streams at once) to a
total of two volumes (some savesets are on only one volume, some span
both volumes). These 20 savesets are (and will be) the only savesets on
those two volumes. If running the nsrclone program via a script (or by
hand), exactly how can it be made to clone more than one saveset at one
time?
Just specify all the savesets. In other words, don't run 20 nsrclones
with one saveset apiece, run 1 nsrclone with 20 savesets.
As it reads a tape, any saveset fragment that matches will be cloned.
So multiplexed savesets that match are cloned in one pass (and remain
multiplexed on the clone).
Now the process will only ever read one volume at a time. So you're
running multiplexed savesets in parallel, but you're running volumes in
serial. If you wanted to parallelize across them, you'd need multiple
nsrclone processes, and you'd still have to handle any savesets that
crossed volume boundaries.
If I have a volume that had 4 save streams written to it at once
via multiplexing, can I have nsrclone take those 4 savesets and clone
them all at once
yes.
or does nsrclone have to de-mux the data and clone one
saveset, and then repeat the entire process for the other three, thus
taking upto 4 times as long to complete?
no.
I've tried nsrclone with various switches (clone by specifying saveset
ids, volume names, volume ids, etc....) and it always appears to do the
cloning in serial, not parallel.
I've not used 7.x, but 5.x and 6.x have behaved as I've described
above.
--
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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