How do I get back my previous minfree level of performance ?
Juri Mianovich
juri_mian at yahoo.com
Mon Aug 27 07:35:30 PDT 2007
--- 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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