Re: how to resize partition without losing data?

Tibbetts, Ric Wed, 29 Jan 2003 12:19:20 -0800

LVM is good stuff.
Unfortunately, it's only good stuff if you install it at the begining. It cannot be retroactivly installed. (that's the bad news).

If you're building a new system, you'll need to do some planning for your filesystems. The boot partition cannot be on an LVM. So you can end up with something like:

Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hda1 124427 19935 98068 17% /boot
/dev/datavg/rootlv 253871 139648 101116 59% /
/dev/datavg/usrlv 2064208 1876556 82796 96% /usr
/dev/datavg/varlv 507748 64738 416796 14% /var
/dev/datavg/tmplv 126931 4756 115622 4% /tmp
/dev/datavg/optlv 2064208 56692 1902660 3% /opt
/dev/datavg/srclv 1032088 198744 780916 21% /usr/src
/dev/datavg/locallv 2064208 47968 1911384 3% /usr/local
/dev/datavg/homelv 4128448 165852 3752884 5% /home
/dev/datavg/Datalv 25040764 252444 23516308 2% /Data
none 256592 0 256592 0% /dev/shm

Note that /boot is on /dev/hda1, not on the logical volume. The remainder of the box, is build on logical volumes.

Sistina has a lengthly discussion on LVM. It's really not as complex as it sounds. It just takes a little doing to get your head around it. It makes more sense (human sense) if you are dealing with multiple drives. It gets kinda fuzzy when you start speaking of "Volume Groups" in reference to a single drive. ;)

I don't think there is a HOW-TO out yet for it. Maybe someone needs to prod me with a sharp stick, and make me write one... (I suppose if I'm going to rant about it, the least I could do is write up a simple mini-HOW-TO on the subject..

Ric

Turner, John wrote:

Cool, thanks for the 8.0 info.

John
-----Original Message-----
From: Tibbetts, Ric [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 29, 2003 2:28 PM
To: [EMAIL PROTECTED]
Subject: Re: how to resize partition without losing data?

Doug;
Thanks for adding that. I meant to put in a link to sistina, and didn't.
Yes, LVM is included with RH 8.0. In fact, you can set it up at install time.

I'm not sure that ext3 will expand "on the fly" though. I haven't tried. But ReiserFS, jfs, and xfs all will.

Ric

Douglas Myers wrote:

http://www.sistina.com/products_lvm.htm

lvm homepage, has HOWTO, etc

I'd also suggest looking into a filesystem that expands
easily on the

fly, reiserFS, jfs (needs a patch), xfs, etc. I'd also
grab the latest

toolset for lvm from there as well.

I'm not sure on 8.0, but on 7.2 and 7.3, the RH kernel
doesn't have lvm

in the kernel by defualt, IIRC

/-------Original Message-------/

/*From:*/ [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
/*Date:*/ Wednesday, January 29, 2003 10:18:54
/*To:*/ '[EMAIL PROTECTED]' <mailto:[EMAIL PROTECTED]>
/*Subject:*/ RE: how to resize partition without losing data?

OK, cool. Thanks for the rant.

Now, how about a pointer to more information on LVM, like a
HOWTO, whether
it's installed by default in 7.2/7.3/8.0, where to get it,
etc. instead????
John

> -----Original Message-----
> From: Tibbetts, Ric [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, January 29, 2003 12:56 PM
> To: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> Subject: Re: how to resize partition without losing data?
>
>
> John Norris wrote:
> > I ran into the sae problem on my pc, I am dual booting XP,
> and Linux. I
> > used Partition Magic 8.0 and resized the partitions in
> windows. Partiton
> > Magic also supports vfat....
>
> People really need to get on the bandwagon, and get LVM
> installed & working.
> There's nothing bugs me worse than to see soemone answer a Linux
> question with "I have this great Windows utility..".
>
> LVM folks. Look it up, learn it, use it! IT's the answer to
> situations
> like this one.
>
> Once set up, I can do fun things like:
>
> enlarge a filesystem "on the fly" (no reboots required,
no data loss).
> Add new filesystems "on the fly". No reboot required.
>
> And more!
> IT's part of Linux now. Stop depending on Windows
solutions. LVM has
> been with unix for many years. IBM pioneered it a long time
> ago. It has
> since been adopted by nearly every other vendor under the sun.
>
> There's no need for the continued dependance on Windows based
> solutions.
> It's an insult to the Linux community to do so.
>
>
> JMHO-YMMV
>
> Ric
>
>
> >
> >
> >
> >
> >
> >
> >> From: Daniel Rubin <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>
> >> Reply-To: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> >> To: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> >> Subject: how to resize partition without losing data?
> >> Date: Wed, 29 Jan 2003 09:39:07 -0800 (PST)
> >>
> >> have used up 98% of my /usr, and need to increase
> >> space in /usr. How do I resize it without losing data?
> >>
> >>
> >> __________________________________________________
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