JFS and largefiles

[James Odak]

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

[PIYUSH D. PATEL]

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

[James R. Ferguson]

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...

[James Odak]

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

[James R. Ferguson · Accepted solution]

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...

[S.K. Chan]

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.

[Jeff Schussele]

Hi Jim,

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

Rgds,
Jeff

[A. Clay Stephenson]

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