How do I get back my previous minfree level of performance ?

[Juri Mianovich]

--- JH <jh at s6.sector6.net> wrote:

> Setting minfree very very low probably isn't wise,
> but I'm sure you knew
> about cylinder groups and block allocation before
> your change, so I won't
> flog *that* horse.


Please do...  I knew it was a "bad" idea, but given
how it was working perfectly with a minfree of one,
I
didn't think it would be the end of the world moving
it to zero.

But more to the point, I thought that if I did not
use
up the space that I gained by going to zero, I could
always go back to one without any repurcussions.  It
turns out I can't, and that is the point of this
post.


> On 8/27/07, Juri Mianovich <juri_mian at yahoo.com>
> wrote:
> 
> > the crashes that going to zero caused _persist_
> after going back to one.
> 
> 
> Please describe "crash" in a follow-up message to
> the list.
> Maybe some output from "bt" (backtrace) or similar
> would be helpful?  Advice
> on reporting kernel trouble may be found at


System floods the console with:

Warning! Controller is no longer running! 
code=0xbcef0100

(after a page or so of aac0 timeout messages)

It's not interesting - anyone can crash the aac card
with too much filesystem stress.  I have seen it
many
times before.  The problem is that this time, I
cannot
reduce the stress by doing anything but leaving that
particular filesysem unmounted.

But troubleshooting and reducing causes has made it
perfectly clear that _it really is_ the change of
minfree from 1 -> 0 -> 1 that has caused this
problem.

So the questions remains:

1. what did I do to my filesystem when I changed the
minfree from 1 to 0 to 1  ?  How is my current
minfree-of-1 filesystem different from my old
minfree-of-1 filesystem ?

2. How do I get back my old minfree-of-1 filesystem
? 
I have enough free space to do it (of course, since
it
currently _is_ at minfree of 1) ... do I need to
defragment, or maybe delete some more files and go
to
a minfree of 2 ?  Or has that filesystem become too
jumbled for any amount of minfree to get it back to
normal ?

Thanks.

>        
>
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