[linux-lvm] ext3 slash

[linux-lvm] ext3 slash

[Geoff Dolman]

Hi

I have installed a machine with a /boot in a normal partition and all
other partitions including / on ext3 logical volumes.
(Red Hat 9/lvm 1.0.3).

I want to snapshot dump these partitions but I didn't realise at the
time of the install that I would have to patch the kernel to be able to
do this with ext3 filing systems.
I don't want to have to do this so I migrated the partitions to ext2
using tune2fs and changed fstab.

In the case of / and /var I booted into rescue mode from cd to run
tune2fs against those volumes read-only.

When I rebooted the machine I got a panic because there was no journal
found on /. Rebooting into rescue mode and restoring the journal on
slash cures this problem.

How can I change the slash volume from ext3 to ext2? As I mentioned I
edited fstab so there must be some other record somewhere telling the
kernel that slash is ext3 but what? Do I need to make a new initrd.img?

Many thanks
-- 
Geoff Dolman <geoff.dolman@cimr.cam.ac.uk>

Re: [linux-lvm] ext3 slash

[Heinz J . Mauelshagen]

On Fri, Jun 06, 2003 at 09:34:37AM +0100, Geoff Dolman wrote:
> Hi
> 
> I have installed a machine with a /boot in a normal partition and all
> other partitions including / on ext3 logical volumes.
> (Red Hat 9/lvm 1.0.3).
> 
> I want to snapshot dump these partitions but I didn't realise at the
> time of the install that I would have to patch the kernel to be able to
> do this with ext3 filing systems.
> I don't want to have to do this so I migrated the partitions to ext2
> using tune2fs and changed fstab.
> 
> In the case of / and /var I booted into rescue mode from cd to run
> tune2fs against those volumes read-only.
> 
> When I rebooted the machine I got a panic because there was no journal
> found on /. Rebooting into rescue mode and restoring the journal on
> slash cures this problem.
> 
> How can I change the slash volume from ext3 to ext2? As I mentioned I
> edited fstab so there must be some other record somewhere telling the
> kernel that slash is ext3 but what? Do I need to make a new initrd.img?

Check if your lilo/grub entry contains a "rootfstype=" entry and change that
if it says ext3.

> 
> Many thanks
> -- 
> Geoff Dolman <geoff.dolman@cimr.cam.ac.uk>
> 
> _______________________________________________
> 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/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] ext3 slash

[Geoff Dolman]

On Fri, 2003-06-06 at 09:46, Heinz J . Mauelshagen wrote:
> On Fri, Jun 06, 2003 at 09:34:37AM +0100, Geoff Dolman wrote:
> > Hi
> > 
> > I have installed a machine with a /boot in a normal partition and all
> > other partitions including / on ext3 logical volumes.
> > (Red Hat 9/lvm 1.0.3).
> > 
> > I want to snapshot dump these partitions but I didn't realise at the
> > time of the install that I would have to patch the kernel to be able to
> > do this with ext3 filing systems.
> > I don't want to have to do this so I migrated the partitions to ext2
> > using tune2fs and changed fstab.
> > 
> > In the case of / and /var I booted into rescue mode from cd to run
> > tune2fs against those volumes read-only.
> > 
> > When I rebooted the machine I got a panic because there was no journal
> > found on /. Rebooting into rescue mode and restoring the journal on
> > slash cures this problem.
> > 
> > How can I change the slash volume from ext3 to ext2? As I mentioned I
> > edited fstab so there must be some other record somewhere telling the
> > kernel that slash is ext3 but what? Do I need to make a new initrd.img?
> 
> Check if your lilo/grub entry contains a "rootfstype=" entry and change that
> if it says ext3.
> 


No - unfortunately not - all I have is

title Red Hat Linux (2.4.20-18.9smp)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-18.9smp ro root=/dev/Volume00/slash
        initrd /initrd-2.4.20-18.9smp.img

and a similar entry for UP.

> > 
> > Many thanks
> > -- 
> > Geoff Dolman <geoff.dolman@cimr.cam.ac.uk>
> > 
> > _______________________________________________
> > 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/
-- 
Geoff Dolman <geoff.dolman@cimr.cam.ac.uk>

Re: [linux-lvm] ext3 slash

[Geoff Dolman]

On Fri, 2003-06-06 at 11:05, Geoff Dolman wrote:
> On Fri, 2003-06-06 at 09:46, Heinz J . Mauelshagen wrote:
> > On Fri, Jun 06, 2003 at 09:34:37AM +0100, Geoff Dolman wrote:
> > > Hi
> > > 
> > > I have installed a machine with a /boot in a normal partition and all
> > > other partitions including / on ext3 logical volumes.
> > > (Red Hat 9/lvm 1.0.3).
> > > 
> > > I want to snapshot dump these partitions but I didn't realise at the
> > > time of the install that I would have to patch the kernel to be able to
> > > do this with ext3 filing systems.
> > > I don't want to have to do this so I migrated the partitions to ext2
> > > using tune2fs and changed fstab.
> > > 
> > > In the case of / and /var I booted into rescue mode from cd to run
> > > tune2fs against those volumes read-only.
> > > 
> > > When I rebooted the machine I got a panic because there was no journal
> > > found on /. Rebooting into rescue mode and restoring the journal on
> > > slash cures this problem.
> > > 
> > > How can I change the slash volume from ext3 to ext2? As I mentioned I
> > > edited fstab so there must be some other record somewhere telling the
> > > kernel that slash is ext3 but what? Do I need to make a new initrd.img?
> > 
> > Check if your lilo/grub entry contains a "rootfstype=" entry and change that
> > if it says ext3.
> > 
> 
> 
> No - unfortunately not - all I have is
> 
> title Red Hat Linux (2.4.20-18.9smp)
>         root (hd0,0)
>         kernel /vmlinuz-2.4.20-18.9smp ro root=/dev/Volume00/slash
>         initrd /initrd-2.4.20-18.9smp.img
> 
> and a similar entry for UP.

More Information:

On a test machine I have just booted from cd into rescue mode and tried
to use lvmcreate_initrd.img to make a new initrd.img after changing / to
ext2.
I got cpio not enough space on device as an error message even though
the machine is nowhere near full on any filesystem including /tmp.

I then tried using mkinitrd to do the same thing and edited grub and
rebooted. This has worked with the minor inconvenience of having to do
an fsck when the machine rebooted.

-- 
Geoff Dolman <geoff.dolman@cimr.cam.ac.uk>

Re: [linux-lvm] ext3 slash

[Heinz J . Mauelshagen]

On Fri, Jun 06, 2003 at 11:35:24AM +0100, Geoff Dolman wrote:
> On Fri, 2003-06-06 at 11:05, Geoff Dolman wrote:
> > On Fri, 2003-06-06 at 09:46, Heinz J . Mauelshagen wrote:
> > > On Fri, Jun 06, 2003 at 09:34:37AM +0100, Geoff Dolman wrote:
> > > > Hi
> > > > 
> > > > I have installed a machine with a /boot in a normal partition and all
> > > > other partitions including / on ext3 logical volumes.
> > > > (Red Hat 9/lvm 1.0.3).
> > > > 
> > > > I want to snapshot dump these partitions but I didn't realise at the
> > > > time of the install that I would have to patch the kernel to be able to
> > > > do this with ext3 filing systems.
> > > > I don't want to have to do this so I migrated the partitions to ext2
> > > > using tune2fs and changed fstab.
> > > > 
> > > > In the case of / and /var I booted into rescue mode from cd to run
> > > > tune2fs against those volumes read-only.
> > > > 
> > > > When I rebooted the machine I got a panic because there was no journal
> > > > found on /. Rebooting into rescue mode and restoring the journal on
> > > > slash cures this problem.
> > > > 
> > > > How can I change the slash volume from ext3 to ext2? As I mentioned I
> > > > edited fstab so there must be some other record somewhere telling the
> > > > kernel that slash is ext3 but what? Do I need to make a new initrd.img?
> > > 
> > > Check if your lilo/grub entry contains a "rootfstype=" entry and change that
> > > if it says ext3.
> > > 
> > 
> > 
> > No - unfortunately not - all I have is
> > 
> > title Red Hat Linux (2.4.20-18.9smp)
> >         root (hd0,0)
> >         kernel /vmlinuz-2.4.20-18.9smp ro root=/dev/Volume00/slash
> >         initrd /initrd-2.4.20-18.9smp.img
> > 
> > and a similar entry for UP.
> 
> More Information:
> 
> On a test machine I have just booted from cd into rescue mode and tried
> to use lvmcreate_initrd.img to make a new initrd.img after changing / to
> ext2.
> I got cpio not enough space on device as an error message even though
> the machine is nowhere near full on any filesystem including /tmp.
> 
> I then tried using mkinitrd to do the same thing and edited grub and
> rebooted. This has worked with the minor inconvenience of having to do
> an fsck when the machine rebooted.

Hmmm, didn't expect an /etc/fstab (which will have an fs type filed entry)
in the initrd.

> 
> -- 
> Geoff Dolman <geoff.dolman@cimr.cam.ac.uk>
> 
> _______________________________________________
> 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/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] ext3 slash

[Luca Berra]

Geoff Dolman wrote:
> How can I change the slash volume from ext3 to ext2? As I mentioned I
> edited fstab so there must be some other record somewhere telling the
> kernel that slash is ext3 but what? Do I need to make a new initrd.img?
yes, you have to create a new initrd, after writing ext2 in the /etc/fstab.

mkinitrd -v -f /boot/initrd-k.v.e-r.img k.v.e-r

-- 
Luca Berra -- bluca@comedia.it
 /"\
 \ /     ASCII RIBBON CAMPAIGN
  X        AGAINST HTML MAIL
 / \