[oclug] ext2 defragmentation
ajh at finux.org
Tue Jan 23 19:01:53 EST 2001
On Tue, Jan 23, 2001 at 06:47:24PM -0500, Dan Cardamore wrote:
> Hey all,
> My server has a partition that is very fragmented at 50.7%. This has
> sparked me into thinking of how I'm going to solve this problem :)
> I have 2 questions:
> 1) How do you check (without unmounting) how fragmented your partition
> 2) How can I defragment this without reformatting?
50% non contigious is a sign that you have been running with your
disk almost full (or full to non-root).
Bring your utilization below 80% and keep it there. If you know you have
large files that were built in a very small chunk at a time way, (like
if you put /var on /) then moving them to another filesystem and back
with cp -a for example will defrag them (assuming you have enough
space free to write them without resorting to filling holes in other
Having /var on a partition of its own is a good idea.
When doing any movement of files like this I cannot stress this enough:
DO IT IN SINGLE USER MODE! also make sure you do your syntax correctly.
Doing "echo > logfile" in /var/log/ for any huge logs would also likely
Andrew J. Hutton,
Ottawa Linux Symposium, International Linux Developers Conference
http://www.linuxsymposium.org/ July 25th-28th, 2001
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