[linux-lvm] Snapshots with Debian 2.4.26

[linux-lvm] Snapshots with Debian 2.4.26

[Mark Komarinski]

Right.  I'm off breaking all the rules here.  Here's what I have:

Debian backport of 2.4.26 (only change was adding 64G support)
Debian stable (1.0.4 it says)

I want to use snapshots for backing up oracle, but here's what I have:

cliff:~# lvcreate -l1 -s -n oracle_control_1_snap /dev/vg00/oracle_control_1
lvcreate -- INFO: using default snapshot chunk size of 64 KB for 
"/dev/vg00/oracle_control_1_snap"
lvcreate -- doing automatic backup of "vg00"
lvcreate -- logical volume "/dev/vg00/oracle_control_1_snap" 
successfully created

cliff:~# mount /dev/vg00/oracle_control_1_snap /snapshot/oracle/
mount: block device /dev/vg00/oracle_control_1_snap is write-protected, 
mounting read-only
mount: wrong fs type, bad option, bad superblock on 
/dev/vg00/oracle_control_1_snap,
        or too many mounted file systems
cliff:~#

(The size of the lv that I'm doing a snapshot of is 1 64M extent, so 
doing a 1 extent in size should be enough, yes?)

My understanding is that this is a result of the VFS patch not being 
applied.  But there doesn't seem to be a VFS patch for 2.4.26.

Any ideas?  I can provide whatever additional information you need, but 
this is really strange.

-Mark

-- 
Mark Komarinski				mkomarinski@hms.harvard.edu
Sr. Linux/UNIX System Administrator	http://wqcg.med.harvard.edu
West Quad Computing Group
Harvard Medical School

Re: [linux-lvm] Snapshots with Debian 2.4.26

[Mark Komarinski]

Mark Komarinski wrote:
> Right.  I'm off breaking all the rules here.  Here's what I have:
> 
> Debian backport of 2.4.26 (only change was adding 64G support)
> Debian stable (1.0.4 it says)
> 
> I want to use snapshots for backing up oracle, but here's what I have:
> 
> cliff:~# lvcreate -l1 -s -n oracle_control_1_snap 
> /dev/vg00/oracle_control_1
> lvcreate -- INFO: using default snapshot chunk size of 64 KB for 
> "/dev/vg00/oracle_control_1_snap"
> lvcreate -- doing automatic backup of "vg00"
> lvcreate -- logical volume "/dev/vg00/oracle_control_1_snap" 
> successfully created
> 
> cliff:~# mount /dev/vg00/oracle_control_1_snap /snapshot/oracle/
> mount: block device /dev/vg00/oracle_control_1_snap is write-protected, 
> mounting read-only
> mount: wrong fs type, bad option, bad superblock on 
> /dev/vg00/oracle_control_1_snap,
>        or too many mounted file systems
> cliff:~#
> 
> (The size of the lv that I'm doing a snapshot of is 1 64M extent, so 
> doing a 1 extent in size should be enough, yes?)
> 
> My understanding is that this is a result of the VFS patch not being 
> applied.  But there doesn't seem to be a VFS patch for 2.4.26.
> 
> Any ideas?  I can provide whatever additional information you need, but 
> this is really strange.
> 
> -Mark
> 

I'll follow up to myself, as I found the problem.

I was able to find the 2.4.22 VFS patch which applied pretty cleanly 
(there was a DM patch, but since I'm not using it, there was nothing to 
apply).  Rebooted and it's working fine.

-Mark

-- 
Mark Komarinski				mkomarinski@hms.harvard.edu
Sr. Linux/UNIX System Administrator	http://wqcg.med.harvard.edu
West Quad Computing Group
Harvard Medical School

Re: [linux-lvm] Snapshots with Debian 2.4.26

[Delian Krustev]

On Thursday 01 July 2004 16:23, Mark Komarinski wrote:
> I'll follow up to myself, as I found the problem.
>
> I was able to find the 2.4.22 VFS patch which applied pretty cleanly
> (there was a DM patch, but since I'm not using it, there was nothing to
> apply).  Rebooted and it's working fine.

Take a look at this message:

Re: [linux-lvm] Snapshot support for LVM2?
From: Alasdair G Kergon <agk@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Date: Mon, 17 May 2004 13:33:51 -0500