forcing a permanent "time" optimization with tunefs ?

[Juri Mianovich]

--- Dag-Erling Sm�rgrav <des at des.no> wrote:


> BTW, explain this: if you don't care about
> conserving space, why did you
> lower minfree in the first place?


As per the original thread, I _did_ care about
conserving space, and in fact would _very much like_
to optimize for space.

However, it turns out that the 6.2-RELEASE version of
aac combined with a adaptec 2820sa is overwhelmed by
the combination of:

- 0% minfree
- quotas
- a few rsync processes

So I _immediately_ tuned it right back to 1% minfree
where it had been for 200+ days.

Oops - it turns out that going downwards in minfree is
a one-way operation, in some aspects - and going back
to 1% did not reduce the stress on the controller.

So what I needed very desperately was to find a way to
force it to optimize for time, and not for space, even
though I had not yet freed up enough bytes to move all
the way to 6% minfree.

Days later, I was able to move to 6% minfree, and my
immediate problems are over.

So there's your answer.  It turns out that I _did_
have a reason to quickly force a filesystem into
"time" optimized, even though its not the best thing
overall.



       
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