> On Jan 4, 2018, at 11:59 AM, Ned Danieley <ned.danie...@duke.edu> wrote:
>
>
> I'm using
>
> taperalgo largestfit
>
> which I assume means that amanda will write to tape the largest DLE
> available. I have 'runtapes' set to 2, and occasionally I'll see amanda
> move on to the second tape when the first tape is reporting around 80% full.
> I'm dumping almost 200 DLE, so it seems like there ought to be some DLEs
> that would fit in the remaining 20%. is there any way to find out (after
> the fact) what DLEs were in the queue? I've looked at the taper debug file
> but it just seems to have a list of each DLE as it is written.
>
> I'm using LTO6 tapes, so I should have about 2.5 TB to work with. I know
> about the ability to split DLEs, but I'm not ready to take that step.
>
> --
> Ned Danieley (ned.danie...@duke.edu)
> Department of Biomedical Engineering
> Box 90281, Duke University
> Durham, NC 27708 (919) 660-5111
>
> http://dilbert.com/strips/comic/2012-02-11/
Did you actually test the size of your own tapes? (There’s a proceedure that
does this …. help me
out with the name, guys?)
Amanda, I believe, uses your number to decide how much space is left on the
tape. It’ll
pick the biggest DLE that ought to fit in that spot (“largestfit”). If
you’ve over-estimated
the tape size, then this DLE will NOT fit. At that point, amanda can’t back
up and try
a smaller DLE. It merely stops trying with that DLE (saves it for later) and
moves on to
the next tape.
At this point, the “largestfit” is probably a bigger DLE, since the whole
tape is available
for the second tape.
Rinse and repeat.
So — maybe tell amanda a smaller size for the tape? Then it’ll try a smaller
“last” DLE,
and it will actually fit.
At least, this is my understanding of how she works.
Deb Baddorf
Fermilab
