Hi Kelly,
your're right, a multistream restore is one of the items on top of our
wishlist.

Just one thought on collocation:
With collocation you can't mount as many tapes as without, ok. But with
collocation, data from one node is much more compactly written to one
tape. So when you don't use collocation and you have to mount 50 instead
of 7 tapes (or even 7 instead of one) you have to keep in mind that TSM
has to skip 6/7 of the data on the tapes while reading them.

So collocation would remain an important feature, the benefit just
decreasing in size (compared to now).

Best regards,
Michael


Kelly Lipp wrote:
>
> On the wishlist item:
>
> I have heard talk about implementing an automatic multi-stream restore
> similar to what we have now with backup and resourceutilization.  This will
> be slick but then only really slick if one uses collocate=filespace.  I
> believe it will still provide better restore times since it will know what
> tape volumes client data is on and will mount multiple volumes.  If one
> thinks about this for a few minutes, one realizes the whole thing is damn
> complicated.  Also, it would appear that collocation would not be a good
> thing if you use this technique: you want data on multiple tapes.
>
--
Michael Bartl                               mailto:michael.bartl AT cw DOT com
Michael Bartl                               mailto:michael.bartl AT cw DOT com
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