Improper shutdown of system / Fragmentation Problems / Boot
jerrymc at clunix.cl.msu.edu
Wed Jun 9 11:45:28 PDT 2004
> 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.
> > 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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