Improper shutdown of system / Fragmentation Problems / Boot

[Randy Pratt]

On Wed, 9 Jun 2004 14:45:06 -0400 (EDT)
Jerry McAllister <jerrymc at clunix.cl.msu.edu> wrote:

> > 
> > 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.

While most of the data/files are stable, there's probably a few
Gigs that come and go with fair regularity.  I update the box
very frequently (ports, docs and sources) so that adds to the
churning I'm sure.

I'll start watching for any performance hits the next time it gets
over 95% full.  I'm just a bit surprised that I've not noticed
anything.

Thanks for the response.  Much appreciated.

Best regards,

Randy

> ////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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> > 
> 


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