From: pSeries AIX Geek (aixgeek@YAHOO.COM)
Date: Tue Nov 12 2002 - 23:07:17 EST
Actually, it's the LVCB (logical volume control
block), the first 512 bytes of the LV, not the ODM.
There's nothing from the file system definition
stashed in the ODM.
You can read the LVCB with 'getlvcb -AT lvname'.
--- "Gupta, Virender - Information Technology
<virender_gupta@timeinc.com>"
<Virender_Gupta@TIMEINC.COM> wrote:
> Jennifer:
> In general, do not edit /etc/filesystems, if you can
> help it. ODM info is not updated when systems files
> are edited directly. Here are the commands to
> change mount points. Assume you want to switch the
> lv's mounted at /u1 and /u2
>
> umount /u1
> umount /u2
> mkdir /junk1
> mkdir junk2
> chfs -m /junk1 /u1
> chfs -m /junk2 /u2
> chfs -m /u2 /junk1
> chfs -m /u1 /junk2
> mount /u1
> mount u2
>
> /junk1 /junk2 are used as place holders. You can
> simply delete them when done.
>
> Viren Gupta
> Time Inc.
>
>
> -----Original Message-----
> From: Page, Jennifer
> [mailto:Jennifer.Page@RBCDAIN.COM]
> Sent: Tuesday, November 12, 2002 1:03 PM
> To: aix-l@Princeton.EDU
> Subject: Re: How to enable a large file system
>
>
> Could you save a step (if there is a large amount of
> data):
>
> (1) create 2nd lv/fs --> largefiles enabled
> (2) mount 2nd lv/fs and copy contents in
> (3) un-mount original lv/fs and 2nd lv/fs
> (4) edit the /etc/filesystems file (back up
> first) and switch the mount points
> (5) mount correct filesystem on 1stfs/2ndlv and
> remove 2ndfs/1stlv
>
> *don't have to copy the data twice.
> **What's the common consensus of editing the
> /etc/filesystem file?
>
>
> -----Original Message-----
> From: Bill Thompson
> [mailto:bill.thompson@GOODYEAR.COM]
> Sent: Tuesday, November 12, 2002 6:16 AM
> To: aix-l@Princeton.EDU
> Subject: Re: How to enable a large file system
>
>
> pAG,
>
> Did you read the original question and the entire
> response? They asked how to change a filesystem to
> largefile enabled. They didn't ask how to do it
> dynamically. Not only is there a way to do this, but
> the response spelled out exactly how it can be done:
>
> Backup the data - delete the logical volume -
> recreate it with largefiles enabled - restore the
> data
>
> Not easy but it works.
>
> I've worked with UNIX for a long time and I very
> rarely say there is "NO" way.
>
> There are many things that have to be done the
> "hard" way. Every migrate to a new server? Can't be
> done dynamically but of course it can is done all
> the time.
>
> I think saying this can't be done is not only
> overreacting and exaggerating it is just plain
> wrong.
>
> support@xiatecs.net gave the correct answer.
>
> Bill Thompson
> Sr UNIX Systems Administrator
> The Goodyear Tire & Rubber Co.
>
> Contains Confidential and/or Proprietary Information
> May Not Be Copied or Disseminated Without Express
> Consent of The Goodyear Tire & Rubber Company.
>
> AIX-L Archives:
> http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
>
>
> ----- Original Message -----
> From: "pSeries AIX Geek" <aixgeek@YAHOO.COM>
> Newsgroups: bit.listserv.aix-l
> To: <aix-l@Princeton.EDU>
> Sent: Monday, November 11, 2002 10:16 PM
> Subject: Re: How to enable a large file system
>
> > Why even give him hope by saying "no easy way"?
> There
> > is NO way. The inodes have a completely different
> > structure with the large file-enabled file system.
> > Even if you attempt were write a C-program to go
> and
> > muck with the inode tables, I think you could
> easily
> > map a scenario where you would't be able to remap
> > them. I.e., only under very limited circumstances
> > could this even be attempted -- hence, I'd just
> say,
> > "there's NO way" and I wouldn't be overreacting or
> exaggerating.
> >
> > - pAG
> >
> >
> > --- support <support@xiatecs.net> wrote:
> > > Frank,
> > >
> > > unfortunately, there is no easy way to do it
> after
> > > creating the file system.
> > > The only way now is to backup the file system,
> > > remove it, recreate the file
> > > system as large enabled file system, finally
> reload
> > > you backup.
> > >
> > > XiaTecs Support Team
> > > support@xiatecs.net
> > > www.xiatecs.net
> > >
> > >
> > > -----Original Message-----
> > > From: IBM AIX Discussion List
> [mailto:aix-l@Princeton.EDU]On Behalf
> > > Of fcheung
> > > Sent: Thursday, November 07, 2002 12:22 PM
> > > To: aix-l@Princeton.EDU
> > > Subject: How to enable a large file system
> > >
> > >
> > > Admins,
> > >
> > > Could someone guide me to change enable a large
> file support on a
> > > existing file
> > > system? I changed the file limit to unlimited on
> > > /etc/security/limit.
> > > But I can't
> > > change the Fragment Size and Allocation Group
> Size
> > > on a existing file
> > > system.
> > >
> > > Thanks
> > >
> > >
> > > Frank
> >
> >
> > __________________________________________________
> > Do you Yahoo!?
> > U2 on LAUNCH - Exclusive greatest hits videos
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