Fragmentation

[Trevor Meredith]

Just want to know if there is any utility available for defragmenting, (or anything similar to that), drives in HP-UX.

Thank you
Trevor

[Steven E. Protter · Accepted solution]

The base OS has no tools to deal with fragmentation that I know of. You can periodically back up the filesystem and run newfs.

I don't think fragmentation is a huge problem with vxfs/JFS filesystems, but you'll get debate on that topic.

OnlineJFS comes with a defragmentation tool. Since our order has not gotten to us yet, I don't know how to use it. OnlineJFS costs bucks but its worth it.

SEP

[Robert-Jan Goossens]

Hi Trevor,

Take a look at nect doc,

http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062972960

Regards,
Robert-Jan.

[Robert-Jan Goossens]

http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062683855

Document description: Defragmenting using online JFS
Document id: JFS33KBAN00000250

Good weekend.

[Brian Bergstrand]

With HFS you don't have to really worry about fragmentation until the drive reaches 90% capacity.

With JFS, things are not quite so easy. In general, it acts the same as HFS, but it can fragment more than HFS even when not full. If you paid for Online JFS, you can use fsadm in a cron script everynight to defragment extents and directory entries (without unmounting). You can eve run reports to see what is fragmented. But this is only if you've paid for OJFS. The base JFS that comes with the system will not do these things.

HTH.

[Pete Randall]

Trevor,

Here's the script that I use for nightly defragging (assuming you have OnlineJFS):

for i in `bdf -l |grep -v Filesystem |awk '{ print $6 }'`
do
if [ $i != "/stand" ]; then
echo "Re-Org'ing " $i
fsadm -F vxfs -d -D -e -E $i
fi
done



Pete

[Pete Randall]

Trevor,

Sorry - make that weekly not nightly!



Pete

[Trevor Meredith]

Thank you everyone, you have been a great help.

:)

Best regards
Trevor