[linux-lvm] Ext3, 2.4.26 and lvm snapshot

[linux-lvm] Ext3, 2.4.26 and lvm snapshot

[COMBES Julien (SSII) (VRAIE MELANIE), CETE Lyon/DI/ET/PAMELA]

Hello,

I have some trouble with lvm snapshot with a logical volume formated with
ext3 file system on a linux 2.4.26. This logical volume is active and
mounted. The snapshot is created correctly (with a command like this for
example : lvcreate -L 100M -s -n lvsnap0 /dev/vg01/lv01). But when I try
to mount it, I have this error :
   mount: wrong fs type, bad option, bad superblock on
   /dev/vgt01/tsnap01, or too many mounted file systems
If I format this logical volume in ext2, I can use snapshot without
problem.

I searched on internet and I found some information but it let me
confused. I found many informations about a VFS-patch which seems to be
necessary, but I don't found this patch for a linux kernel 2.4.26 (I only
found it for version up to 2.4.22).

So I wonder if this patch is always necessary ?
Do you have some links which can help me ?

Regards,
Julien
P.S: Sorry for my english which isn't very good.

Re: [linux-lvm] Ext3, 2.4.26 and lvm snapshot

[Jerry Hardwick]

    I WOULD LIKE TO CANCEL MY SUBSCRIPTION THE THIS EMAIL SERVICE. CAN
ANYONE TELL ME HOW IT IS ACCOMPLISHED?  YOUR HELP IS APPRECIATED
----- Original Message ----- 
From: "COMBES Julien (SSII) (VRAIE MELANIE), CETE Lyon/DI/ET/PAMELA"
<julien.combes@i-carre.net>
To: <linux-lvm@redhat.com>
Sent: Tuesday, April 20, 2004 11:41 AM
Subject: [linux-lvm] Ext3, 2.4.26 and lvm snapshot


> Hello,
>
> I have some trouble with lvm snapshot with a logical volume formated with
> ext3 file system on a linux 2.4.26. This logical volume is active and
> mounted. The snapshot is created correctly (with a command like this for
> example : lvcreate -L 100M -s -n lvsnap0 /dev/vg01/lv01). But when I try
> to mount it, I have this error :
>    mount: wrong fs type, bad option, bad superblock on
>    /dev/vgt01/tsnap01, or too many mounted file systems
> If I format this logical volume in ext2, I can use snapshot without
> problem.
>
> I searched on internet and I found some information but it let me
> confused. I found many informations about a VFS-patch which seems to be
> necessary, but I don't found this patch for a linux kernel 2.4.26 (I only
> found it for version up to 2.4.22).
>
> So I wonder if this patch is always necessary ?
> Do you have some links which can help me ?
>
> Regards,
> Julien
> P.S: Sorry for my english which isn't very good.
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>

Re: [linux-lvm] Ext3, 2.4.26 and lvm snapshot

[Wolfgang Weisselberg]

COMBES Julien wrote 29 lines:

[mounting ext3 snapshots fails, ext2 works]

> I searched on internet and I found some information but it let me
> confused. I found many informations about a VFS-patch which seems to be
> necessary, but I don't found this patch for a linux kernel 2.4.26 (I only
> found it for version up to 2.4.22).

Apply the 2.4.22 patch to the 2.4.26 tree, it works.

You may get warnings about the line numbers being a bit off or
even about 'fuzzy' matches, but the 'patch' program is clever
enough to do the right thing.

> So I wonder if this patch is always necessary ?

If you want to mount ext3 snapshots, yes, it is.

-Wolfgang