degragmentation on disk or ram

[Mahesh Kumar Malik]

Hi Shiv

Following link may be of help

http://docs.hp.com/en/5187-1375/ch05s06.html

Regards

Mahesh

[Steven E. Protter]

Shalom Shiv,

Online JFS fsadm defragmenting provides a report that can give you an idea as to whether defragmentation was really necessary, be it after the fact.

I would suggest you see if the utility has a preview mode as many utilities do.

It's important that once its running it be left to complete its task.

Here are the guts to the script I ran in the US:

while read -r aa bb cc dd ee
do
FILESYSTEM=$bb
echo "fs is $bb $cc"
if [ "$cc" = "vxfs" ]
then
/usr/sbin/fsadm -F vxfs -D -d -E -e -s $FILESYSTEM
fi

done < /etc/fstab

# As you see it reads /etc/fstab and only touches those filesystems with vxfs on them.

SEP

[A. Clay Stephenson]

While one can certainly defragment a vxfs filesystem, my experience has been --- except in rare circumstances --- that it is difficult to achieve measurable, much less significant, results. Bear in mind that vxfs filesystems are extent-based and try to allocate large chunks and UNIX filesystems are geared towards creating many, many files in a short period of time.