Is it possible to defragment a FS without Online JFS?

[Eric Antunes]

Hi,

Here's /disc2 fragmentation report:

fsadm -F vxfs -D /disc2

Directory Fragmentation Report
Dirs Total Immed Immeds Dirs to Blocks to
Searched Blocks Dirs to Add Reduce Reduce
total 41369 21005 22581 31 38 578


Is there an alternate way to defragment it than Online JFS? Will some moves do the job??

Eric

[Steven E. Protter · Accepted solution]

Shalom,

Yes.

1) Back up the fs to tape or another fs.
2) Erase everything.
3) Restore it all back.

As to whether its worth it, that is a value judgment.

SEP

[T G Manikandan]

Without Online JFS , you need to recreate the vol volume, the answer is 'NO'.

[Eric Antunes]

Hi SEP,

I'll follow your suggestion for some directories I can delete and see if it gets better.

Thank you,

Eric

[Steven E. Protter]

Follow up: If you go to to tape and then back to an empty file system your files will come back defregmented.

Note if you go to a file system as temporary storage you could get fragmentation due to condition of the file system.

I'm not sure the benefit of my approach is large, but the output of your command:

fsadm -F vxfs -D /disc2

Is different after this procedure.

SEP

[pa8700]

you may use fsadm -F vxfs -E /disks to find the fragmentation level then use fsadm -F vxfs -D /disc2
.Then again use fsadm -F vxfs -E /disks and see there will be difference.

Yes its worthy

[James R. Ferguson]

Hi Eric:

If you are going to backup the whole filesystem; then 'newfs' it; and finally restore it, restoring from another filesystem or from a tape isn't going to make for any more or less fragmentation!

In fact, given the choice, I'd certainly use a disk filesystem. The speed with which you can load it and re-read it will far out-strip the tape handling.

Regards!

...JRF...