[linux-lvm] resize LV

[linux-lvm] resize LV

[Alexander Lazarevich]

I've got a RedHat linux 7.3 system, running LVM 1.03 (or whatever comes 
with the 7.3 distribution). This system is our fileserver. It is patched 
and uses the 2.4.18-19.7.xsmp kernel. I've got one volume group (homevg), 
with 2 LV's in that group (/dev/homevg/stafflv and /dev/homevg/userslv). 
The filesystem on /dev/homevg/userslv need to be expanded by 50GB. There 
are plenty of free PE's left in homevg, more than 126GB.

I know how to expand the LV while the LV is mounted, piece of cake 
(lvextend -L+50GB /dev/homevg/userslv - expands userslv by 50GB). But how 
do I expand the filesystem while it is mounted? I don't want to 
umount the filesystem down to do this.

The filesystem is an ext3 filesystem. Can I use resize2fs? The man pages 
for resize2fs say nothing about doing it while the filesystem is mounted, 
so I'm assuming I can't. If not, is there some other command that does it 
while the filesystem is online?

If I need a kernel patch/recomplile while will allow me to perform 
filesystem resizes while that filesystem is up thats fine, please let me 
know what the patch is. I need it big time, and I should have figured it 
out before I brought the system online! ack!

Thanks in advance!

Alex
---                                                        ---
   Alex Lazarevich | Systems | Imaging Technology Group
   alazarev@itg.uiuc.edu | (217)244-1565 | www.itg.uiuc.edu
---                                                        ---

Re: [linux-lvm] resize LV

[Thomas Kleffel]

Hi!

> I know how to expand the LV while the LV is mounted, piece of cake
> (lvextend -L+50GB /dev/homevg/userslv - expands userslv by 50GB). But how
> do I expand the filesystem while it is mounted? I don't want to
> umount the filesystem down to do this.
>
> The filesystem is an ext3 filesystem. Can I use resize2fs?

No, afaik neither ext2 nor ext3 support resizing while being mounted.
And if I'm not wrong JFS and ReiserFS can't do this either but XFS can.

I'm using XFS for this reason and it works fine for me.

Bye,

Tommy

Re: [linux-lvm] resize LV

[Alexander Lazarevich]

JFS can totally do it. I've been using AIX before we moved to Linux, and I 
did it all the time.

There must be a way to do it on linux systems using ext3. Anyone?

Alex
---                                                        ---
   Alex Lazarevich | Systems | Imaging Technology Group
   alazarev@itg.uiuc.edu | (217)244-1565 | www.itg.uiuc.edu
---                                                        ---


On Tue, 28 Jan 2003, Thomas Kleffel wrote:

> Hi!
> 
> > I know how to expand the LV while the LV is mounted, piece of cake
> > (lvextend -L+50GB /dev/homevg/userslv - expands userslv by 50GB). But how
> > do I expand the filesystem while it is mounted? I don't want to
> > umount the filesystem down to do this.
> >
> > The filesystem is an ext3 filesystem. Can I use resize2fs?
> 
> No, afaik neither ext2 nor ext3 support resizing while being mounted.
> And if I'm not wrong JFS and ReiserFS can't do this either but XFS can.
> 
> I'm using XFS for this reason and it works fine for me.
> 
> Bye,
> 
> Tommy
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 

RE: [linux-lvm] resize LV

[Tren Blackburn]

Yes, you can resize a reiserfs filesystem while mounted.

Regards,

Tren

-----Original Message-----
From: linux-lvm-admin@sistina.com [mailto:linux-lvm-admin@sistina.com]On
Behalf Of Thomas Kleffel
Sent: Tuesday, January 28, 2003 2:01 PM
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] resize LV


Hi!

> I know how to expand the LV while the LV is mounted, piece of cake
> (lvextend -L+50GB /dev/homevg/userslv - expands userslv by 50GB). But how
> do I expand the filesystem while it is mounted? I don't want to
> umount the filesystem down to do this.
>
> The filesystem is an ext3 filesystem. Can I use resize2fs?

No, afaik neither ext2 nor ext3 support resizing while being mounted.
And if I'm not wrong JFS and ReiserFS can't do this either but XFS can.

I'm using XFS for this reason and it works fine for me.

Bye,

Tommy


_______________________________________________
linux-lvm mailing list
linux-lvm@sistina.com
http://lists.sistina.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

RE: [linux-lvm] resize LV

[Kirby C. Bohling]

I haven't at ReiserFS in a year or so, but last I checked, you could
expand a filesystem online, but shrinking online one was not possible if
that is of importance to the original poster.  You can shrink it offline
however.

http://www.namesys.com/resize_reiserfs.html#EXAMPLES
According to the docs, that information is still current about reiserfs.

For JFS:
http://www10.software.ibm.com/developer/opensource/cvs/jfs/linux24/Documentation/filesystems/jfs.txt?rev=1.20&content-type=text
According to this, the current JFS only supports expanding, which I
(which is should do while online).  However, it doesn't appear to
support shrinking it at all.

Now about ext2:

There is a project on sourceforge for the ext2 resizing:
http://ext2resize.sourceforge.net/download.html

Here's a post by the author to in in the LVM mailing archive:
http://linux.msede.com/lvm_mlist/archive/1999/07/0055.html
(I've seen him post about it a lot more recently then that).

Here's a page that appears to have some explaination about it:
http://www-mddsp.enel.ucalgary.ca/People/adilger/online-ext2/

I have no idea how current they all are, I just googled for the ext2
resize online, plenty of links.

Last I knew they don't support ext3, but they wanted to do that.  It
used to take a kernel patch to use it.  I'm not sure if it still does.

	Thanks,
		Kirby



On Tue, 2003-01-28 at 16:13, Tren Blackburn wrote:
> Yes, you can resize a reiserfs filesystem while mounted.
> 
> Regards,
> 
> Tren
> 
> -----Original Message-----
> From: linux-lvm-admin@sistina.com [mailto:linux-lvm-admin@sistina.com]On
> Behalf Of Thomas Kleffel
> Sent: Tuesday, January 28, 2003 2:01 PM
> To: linux-lvm@sistina.com
> Subject: Re: [linux-lvm] resize LV
> 
> 
> Hi!
> 
> > I know how to expand the LV while the LV is mounted, piece of cake
> > (lvextend -L+50GB /dev/homevg/userslv - expands userslv by 50GB). But how
> > do I expand the filesystem while it is mounted? I don't want to
> > umount the filesystem down to do this.
> >
> > The filesystem is an ext3 filesystem. Can I use resize2fs?
> 
> No, afaik neither ext2 nor ext3 support resizing while being mounted.
> And if I'm not wrong JFS and ReiserFS can't do this either but XFS can.
> 
> I'm using XFS for this reason and it works fine for me.
> 
> Bye,
> 
> Tommy
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 
-- 
Real Programmers view electronic multimedia files with a hex editor.

Re: [linux-lvm] resize LV

[Harri Haataja]

On Tue, Jan 28, 2003 at 03:08:12PM -0600, Alexander Lazarevich wrote:
> JFS can totally do it. I've been using AIX before we moved to Linux,
> and I did it all the time.
> There must be a way to do it on linux systems using ext3. Anyone?

> On Tue, 28 Jan 2003, Thomas Kleffel wrote:
> > > I know how to expand the LV while the LV is mounted, piece of cake
> > > (lvextend -L+50GB /dev/homevg/userslv - expands userslv by 50GB).
> > > But how do I expand the filesystem while it is mounted? I don't
> > > want to umount the filesystem down to do this.
> > >
> > > The filesystem is an ext3 filesystem. Can I use resize2fs?
> > No, afaik neither ext2 nor ext3 support resizing while being
> > mounted.  And if I'm not wrong JFS and ReiserFS can't do this either
> > but XFS can.
> > I'm using XFS for this reason and it works fine for me.

FWIW
On the kernels I've used (no JFS patches, notably), ext3, xfs, reiserfs
resize on the fly and jfs (which requires a weird remount option) still
doesn't. IIRC ICBW

And I'm absolutely sure that the reiserfs's I resize while mount every
now and then do so and don't even require force switches anymore.