topic Re: reduce / FS in Operating System - HP-UX

reduce / FS

Vick10 — Tue, 11 Nov 2008 17:43:24 GMT

I've just installed HPUX 11.23 EOE, with default SW selection, while setting the FS size I was suprised to see a message saying that the / partition has to be at least 1152MB for the SW selection, I wanted it to be 1000MB. I had no choice so I set it to 1500MB. After the installation the / FS usage was only 372MB

Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 1540096 327384 1203296 21% /

I need to know :

1. Why did the system says / has to be 1152MB when the actual usage was only 372MB

2. Is there any way to reduce the / partition from 1500MB to 1000MB now ??

Appreciate any leads. Thanks....

Re: reduce / FS

Jaime Bolanos Rojas. — Tue, 11 Nov 2008 17:48:07 GMT

Hi Vick,

Most likely the system was planning for future needs, so given that resizing the / FS is not easy ( well itÂ´s easy :-) ) then it calculated possible future needs.

Now you can make it smaller if you want to, just make a make_tape_recovery, boot from it, enter into interactive mode and resize the root file system to something smaller.

Regards,

Jaime

Re: reduce / FS

Duncan Edmonstone — Tue, 11 Nov 2008 17:54:55 GMT

>> 1. Why did the system says / has to be 1152MB when the actual usage was only 372MB

You don't want a root FS thats at over 90% full do you? Also one day you might want to upgrade this OS to 11iv3, so assigning plenty of space to the filesystems is always a sensible idea. Diskspace is cheap - why do you care about 500MB?

>> 2. Is there any way to reduce the / partition from 1500MB to 1000MB now ??

If you really want to... I guess this would work - but I'd advise you to take an Ignite backup first:

fsadm -F vxfs -b 1024000 /

lvreduce -L 1000 dev/vg00/lvol3

HTH

Duncan

Re: reduce / FS

Ivan Krastev — Tue, 11 Nov 2008 18:14:35 GMT

And before doing any reduce, do a defragmentation of the file system - just in case.

# fsadm -F vxfs -E -e -d -E /

and after that reduce:

# fsadm -F vxfs -b 1024M /

# lvreduce -L 1024M /dev/vg00/lvol3

regards,
ivan

Re: reduce / FS

Steven E. Protter — Tue, 11 Nov 2008 18:40:49 GMT

Shalom,

If you have Online JFS (I think you do), you can us fsadm to reduce the file system hot without downtime or umount.

This is fairly straightforward and is well documented in the man page.

Its fairly i/o intensive, and I always back up the data before doing it.

SEP

Re: reduce / FS

Steven E. Protter — Tue, 11 Nov 2008 18:50:51 GMT

Shalom,

after reducing the file system, lvreduce must be run to get any disk space back.

SEP

Re: reduce / FS

Grayh — Tue, 11 Nov 2008 19:54:43 GMT

Probably also the following should help

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1263888

http://www.unixguide.net/hp/hplvmtasks.shtml

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1261245

Re: reduce / FS

Vick10 — Wed, 12 Nov 2008 04:50:36 GMT

Ivan,

Thanks alot for your solution,
I was able to resize the / FS without having to reinstall the OS,
YOUR'E THE BEST !!

Thanks to everyone else too, who poured some ideas