> I am demultiplexing during duplication

Yup! It looks like your MPX factor is 2 and so you throw away about
half the data you read.

> I thought that multiplexed backups were interwoven fragments.

Nope, the data is multiplexed within the data stream at the block level
and each block has a header that identifies to which stream it belongs.

> Shouldn't I be reading one image's fragment, skipping over another,
> then reading another appropriate fragment?  (you know: "mt fsf #")

Nope. You would require quite a lot of buffering to make this workable.

> Your comments suggest that data within fragments is from
> multiple clients? 

That's how it works. See page 644 of the UNIX Admin Guide.

> If this is the case, I may have the answer to my slow
> duplications

Yes and no. It will slow you down, but only by the level of
multiplexing. Some of us are seeing much worse performance
problems and are preserving the multiplexing.

My vaults will go down to 50KB/s for some random parts :-(


        Peter Urbanec    B.Sc.(Comp.Sci.)  UNSW
        mailto:peter.urbanec AT csfb DOT com


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