Improper shutdown of system / Fragmentation Problems / Boot

[Jerry McAllister]

> 
> On Wed, 9 Jun 2004 07:05:43 +0800
> Robert Storey <y2kbug at ms25.hinet.net> wrote:
> 
> > 
> > > I am kinda new to FBSD, still kinda learning stuff. Anyway, when my
> > > system boots i see all kinda fragmentation information. How do I
> > > correct this? Any good reading material? 
> > 
> > FreeBSD will defragment itself without any action from the user.
> > However, defragmentation requires some blank space, and (ideally) you
> > should not let any partition get more than 80% full. You can check on
> > that with "df -h":
> 
> I've been running partitions well over 90% for over six years on
> FreeBSD and have not seen any problems with doing so.
> 
> Do you have a FreeBSD documentation reference for that 80% figure?

It is mentioned as a recommendation.  It is not an absolute.
Do a little searching and you will probably find some references.
We have some that run in to the 90-s most of the time too.  It
depends on what you are actually doing.   If it is a fairly stable
collection of data that doesn't get a lot written to it most of
the time, it shouldn't matter.   If it is very volatile - lots of
files come and go, then it could make a bigger difference.  Unless
it gets to the 100% mark (except for root) with that 100% being with
the set-aside already taken out, it shouldn't cause anything to crash.

////jerry

> 
> Thanks,
> 
> Randy
> 
> > bob at sonic:~> df -h
> > Filesystem    Size   Used  Avail Capacity  Mounted on
> > /dev/ad0s2a   248M    68M   160M    30%    /
> > devfs         1.0K   1.0K     0B   100%    /dev
> > /dev/ad0s2g   2.4G   281M   1.9G    13%    /home
> > /dev/ad0s2e   248M   1.2M   227M     1%    /tmp
> > /dev/ad0s2f   8.7G   2.4G   5.6G    30%    /usr
> > /dev/ad0s2d   248M    17M   211M     8%    /var
> > 
> > The column labeled "Capacity" tells you the percentage of space being
> > consumed - over 80% would be bad. Note that the "devfs" uses 100% (on
> > FBSD 5.x, it doesn't exist on 4.x) - that's no problem, it's not a
> > partition and it will always be 100%.
> > 
> > regards,
> > Robert
> > 
> > 
> 
> 
> -- 
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