topic Re: filesystem defragmentation in Operating System - HP-UX

filesystem defragmentation

hpuxhelp — Wed, 18 Dec 2002 21:19:25 GMT

I know that online JFS has this feature. But is there any other ways to monitor the disk defragmentation and optimize disk usage and improve I/O ?

Re: filesystem defragmentation

James R. Ferguson — Wed, 18 Dec 2002 21:24:06 GMT

Hi:

'fsadm' is designed both to monitor directory and extent framentation and to perform the reorganization. See the masn pages for 'fsadm'.

Regards!

...JRF...

Re: filesystem defragmentation

Patrick Wallek — Wed, 18 Dec 2002 21:24:17 GMT

There's no way I know of to defragment a whole disk other than to blow away all LVM structures, recreate your VGs and LVs and restore your data.

Your best bet, I think, is to just use the online JFS functionality to defrag your LVOLs.

Re: filesystem defragmentation

Oleg Zieaev_1 — Wed, 18 Dec 2002 21:36:01 GMT

Hello.

fsadm (1m) - to defragment. If you want to optimize disk IO - striping might be the answer for you are looking for or/and change of mount options.

If you don't have Online JFS - blow away your file system and restore, but I would say this is rather unwelcome solution for most installations.

Hope this helps,
0leg

Re: filesystem defragmentation

hpuxhelp — Wed, 18 Dec 2002 21:43:26 GMT

Does o/s 10.20 have online JFS? if it does, could you please tell me what version ??

Re: filesystem defragmentation

Patrick Wallek — Wed, 18 Dec 2002 21:49:09 GMT

10.20 had online JFS available as a separately purchased product (as it is with 11.X).

Here's a link to OnlineJFS:
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/displayProductInfo.pl?productNumber=B3929CA

It appears that it isn't available for 10.20 anymore, but that doesn't surprise me since 10.20 itself isn't available anymore.

Re: filesystem defragmentation

James R. Ferguson — Wed, 18 Dec 2002 21:50:58 GMT

Hi (again):

HP-UX 10.20 supports JFS version 3.0 with disk layout version-2 or version-3. Layout version-3 is the default layout.

Regards!

...JRF...

Re: filesystem defragmentation

hpuxhelp — Wed, 18 Dec 2002 22:01:43 GMT

base on your answer, online JFS is still available for 10.20 ?

Re: filesystem defragmentation

Kelli Ward — Wed, 18 Dec 2002 23:02:48 GMT

Hi,

Unfortunately, I don't think Online JFS is available for purchase anymore on 10.2.
HP-UX 10.2 is no longer a supported product in that regard. You can still get patches and freebies, but I was unable to find Online JFS.
You can check software.hp.com or contact them to be sure.

Good luck,
Kel

Re: filesystem defragmentation

Bill Hassell — Thu, 19 Dec 2002 04:55:24 GMT

10.20 is obsolete and there has been no development on it for more than a year. However, fragmentation is really hard to create on JFS filesystems as the filesystem manager does a good job in reusing space. It would take a very complex set of file creation and deletions to fragment a filesystem to the point that performance would be affected. Most likely, performance issues are related to access methods and the the number of disks and paths to the disks, rather than fragmentation.