Fragmentation in HP-UX

[Erick Amezquita]

Hi

I wish to know if the possible in hp-ux 11.00 B fragmentation in LV, because my aplication in working very slow and I have exessive boottleneck messages.

Thanks

[Sandip Ghosh]

fsadm cn do the trick if you are having Online JFS installed.

Sandip

[James R. Ferguson]

Hi:

Whether or not fragmentation of your VxFS filesystems has any bearing on performance, you will have to assess.

The man pages for 'fsadm_vxfs' actually have a good overview of fragmentation assessment and defragmentation.

Regards!

...JRF...

[Deshpande Prashant · Accepted solution]

Hi
With online JFS, use #fsadm -DE to see defragmentation. and
Use #fsadm -Dd -Ee
to defrag and give before and after report on defragmentation

Thanks.
Prashant.

[Bill Hassell]

Very unlikely. Fragmentation (of the type found on PCs) is just not easy to do in JFS. Your applications would have to create hundreds of large and small files and remove them randomly.

Even with the optional OnLine JFS product, most sysadmins do not see any measureable fragmentation.

Performance questions like this require a lot of additional information about disk activity and CPU time. A bottleneck is an arbitrary definition. For instance, using backup software will create a bottleneck.

[harry d brown jr]

In the 70's thru 1/2 of the 90's we worried a lot about fragmentation, TODAY it's usually not an issue, unless you have a crappy application written by 12 yearolds stoned on crack. It's not a Microsoft Application is it :-?


What kind of tool are you using that tells you you are having bottlenecked messages??

What is a bottlenecked message anyways?

How about some more info here?

(1) what kind of server?

(2) What kind of application?

(3) Memory configuration??

(4) Swap configuration??

(5) Kernel configuration??

(6) PREVIOUS Statistics to base the supposed performance results on?? Without history it's just pure speculation.

(7) and anything else that one would need to know to help resolve this issue?


live free or die
harry

[Mike_305]

Hi,

Since, I don't have any other information. Here is the link on performance that might help.

http://www.docs.hp.com//hpux/onlinedocs/os/11.0/tuningwp.html

Thanks,

Mike