topic Re: JFS and largefiles in Operating System - HP-UX

JFS and largefiles

James Odak — Tue, 25 Jun 2002 20:15:17 GMT

I been looking through all the stuff on JFS and large file enableing
i have question i need a definite answer on that i can not seem to find

If you have online JFS and use the fsadm can you on a file system with an active and running oracle databse enable large files with out unmounting AND with out loosing all the data in the file system

I can't see why you would even bother to want to do this to a mounted file system if it was going to give you an empty file system so maybe this is an obvious question ..but it doesn't state it in any documention that i found.

thanks
Jim

Re: JFS and largefiles

PIYUSH D. PATEL — Tue, 25 Jun 2002 20:19:52 GMT

Hi,

If you have Online JFS and you have vxfs filesystem then you need not unmount the filesystem and you can enable the largefiles option on it with the fsadm command.

fsadm -F vxfs -o largefiles /dev/vg02/lvol2

Umounting is required for hfs filesystem.

Piyush

Re: JFS and largefiles

James R. Ferguson — Tue, 25 Jun 2002 20:20:35 GMT

Hi Jim:

Yes, with Online JFS, you *can* dynamically increase the size of a filesystem, including one housing Oracle datafiles without corruption of data.

Regards!

...JRF...

Re: JFS and largefiles

James Odak — Tue, 25 Jun 2002 20:23:06 GMT

um both of you just missed the the answer i am looking for, heh

can i enable largefiles with JFS without corupting or loosing at any data on a filesystem housing oracle datafiles

Jim

Re: JFS and largefiles

James R. Ferguson — Tue, 25 Jun 2002 20:23:18 GMT

Hi (again)Jim>

Sorry, I misread the question, but:

Yes, with Online JFS, you *can* enable largefiles support using 'fsadm'. This can be done on a a filesystem, one housing Oracle datafiles without corruption of data.

Enabling 'largefiles' really amounts to setting one variable in the internal filesystem description.

Regards!

...JRF...

Re: JFS and largefiles

S.K. Chan — Tue, 25 Jun 2002 20:23:35 GMT

Simply "yes" it's dynamic. Look at this documentation ..
http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B3929-90011/B3929-90011_top.html&con=/hpux/onlinedocs/B3929-90011/00/00/12-con.html&toc=/hpux/onlinedocs/B3929-90011/00/00/12-toc.html&searchterms=onlinejfs&queryid=20020625-143008

Click on "Online System Administration" at the left hand column topics/sections.

Re: JFS and largefiles

Jeff Schussele — Tue, 25 Jun 2002 20:23:54 GMT

Hi Jim,

You sure can - that's the beauty of OnLine JFS. Shouldn't even see a performance blip either.

Rgds,
Jeff

Re: JFS and largefiles

A. Clay Stephenson — Tue, 25 Jun 2002 20:26:18 GMT

Hi Jim:

I was all but absolutely certain but I just tried this on my Sandbox running HP-UX and Oracle 8.1.7.

First I set the nolargefiles flag.
fsadm -F vxfs -o
nolargefiles /PrdOra/oradata

Next I started the database and did a few queries.

Next,
fsadm -F vxfs -o largefiles /PrdOra/oradta

I then did some more queries and Oracle never missed a beat.

The online fsadm command is safe.

Regards, Clay