topic Re: file system defragmentation in Operating System - HP-UX

file system defragmentation

gany59 — Fri, 19 Jun 2009 18:11:04 GMT

hi how to do the file system defragmentation before reducing the file system .Is the defragmentation is applicable to both online JFS and Vxfs or not..please let me know the mount point is /apps. I need to know the syntax..

Re: file system defragmentation

OldSchool — Fri, 19 Jun 2009 18:51:10 GMT

see this post:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1327897

and

"man fsadm"

Not sure, but in some circumstances, OnlineJFS may be required

Re: file system defragmentation

Michael Steele_2 — Fri, 19 Jun 2009 18:59:18 GMT

Hi

JFS is the marketing name for Veritas File System, or, vxfs, aka the tech. name. Base JFS / vxfs comes installed by default with the HP-UX O/S. For you to you defragmentation option and dynamic file system extend option you need a license to activate the Online JFS features.

Easiest way to test:

fsadm -F vxfs -D -E /apps

This is the reporting featuring or preview feature of the -d and -e or defrag options of Online JFS. You get a report, then you have Online and you can run:

fsadm -F vxfs -D -d -E -s /apps.

Note: Once started don't interrupt, and run during off business hours, like in a cron at midnight.

Note: Run before or after backup to reduce contention, probably before is best.

Re: file system defragmentation

Vivek Bhatia — Mon, 22 Jun 2009 04:37:12 GMT

Hi Gany,

You have a mount point /apps and you need to know the process for defragmentation.

1. fsadm -F vxfs -d -v -e /apps

Then you can reduce the file system online with the below command.

2. fsadm -F vxfs -b 15744M /apps

Regards
Vivek

Re: file system defragmentation

gany59 — Mon, 22 Jun 2009 11:36:22 GMT

Hi Vivek

Could u able to tell the expansions of the arguments -d,-v,-e

Re: file system defragmentation

Aneesh Mohan — Mon, 22 Jun 2009 11:39:49 GMT

Hi,

#man fsadm_vxfs

Regards,
Aneesh

Re: file system defragmentation

OldSchool — Mon, 22 Jun 2009 12:12:06 GMT

http://forums13.itrc.hp.com/service/forums/questionanswer.do?threadId=1349185

"see actually this was the question asked to me in interview. so i am very eager to know those things.. could u help me.. "

the purpose of the forums is not to teach hpux, but to assist w/ problems.

Re: file system defragmentation

Vivek Bhatia — Mon, 22 Jun 2009 16:20:34 GMT

Hi Gany,

This is the output meaning of the options.

-d
Reorganize directories. Directory entries are reordered to place subdirectory entries first, then all other entries in decreasing order of time of last access. The directory is also compacted to remove free space.
-e
Extent reorganization. Attempt to minimize fragmentation. Files are reorganized to have the minimum number of extents possible.
-v
Verbose. Report reorganization activity.

It will be great if you assign points to everyone who has replied to your questions.

Regards
Vivek