[linux-lvm] Problem creating snapshots with 2.6.16.9 and LVM 2.02.06

[Roger Lucas]

As a follow up, I have also tried it with the 2.6.16.20 kernel which is
fresh from kernel.org.  Same problem.

> -----Original Message-----
> From: linux-lvm-bounces at redhat.com [mailto:linux-lvm-bounces at redhat.com]
> On Behalf Of Roger Lucas
> Sent: 09 June 2006 14:43
> To: 'LVM general discussion and development'
> Subject: [linux-lvm] Problem creating snapshots with 2.6.16.9 and LVM
> 2.02.06
> 
> Hi,
> 
> I am running what was Debian Sarge but has the new 2.6.16.9 kernel.  I
> have
> made a few patches to the kernel (to add an Areca RAID driver and a few
> hardware sensors) but nothing in the device-mapper areas.  I use the
> snapshots capability in LVM to snapshot the client's userdisk volume when
> backing it up.
> 
> Until a couple days ago, I was running:
> 
> Wombat:~# uname -a
> Linux Wombat 2.6.16.9.rwl7 #1 Tue May 16 20:25:14 BST 2006 i686 GNU/Linux
> Wombat:~# lvm version
>   LVM version:     2.01.04 (2005-02-09)
>   Library version: 1.01.00-ioctl (2005-01-17)
>   Driver version:  4.4.0
> Wombat:~#
> 
> and everything ran fine.
> 
> A few days ago, I saw an e-mail from Alasdair on this mailing list saying
> that kernels 2.6.16 onwards should be using the later userspace tools.
> Following this, I downloaded and compiled the latest device mapper library
> (libdevmapper 1.02) and LVM tools (2.02.06).  When I installed them on the
> machine and re-ran the backup script, I got an error from lvcreate when I
> tried to make the snapshot which I did not get before.  I saw that Patrick
> Honing also reported this error on 29/5/06 on this mailing list, but
> couldn't see any reply.
> 
> For me, this failure is 100% repeatable.
> 
> Can anyone help shed light on this?
> 
> If you need any more information then please let me know and I will send
> it
> in.  My current option seems to be to drop back to the older 2.01.04 lvm
> and
> 1.01 dmapper but given Alasdair's mail, this seems to be risky.
> 
> The full shell trace is below.
> 
> Wombat:~# uname -a
> Linux Wombat 2.6.16.9.rwl7 #1 Tue May 16 20:25:14 BST 2006 i686 GNU/Linux
> Wombat:~# lvm version
>   LVM version:     2.02.06 (2006-05-12)
>   Library version: 1.02.07 (2006-05-11)
>   Driver version:  4.5.0
> Wombat:~# lvs
>   LV          VG          Attr   LSize  Origin Snap%  Move Log Copy%
>   backupimage clientstore -ri-ao 60.00G
>   root        clientstore -wi-ao  5.00G
>   userdisk    clientstore -wi-ao 60.00G
> Wombat:~# vgs
>   VG          #PV #LV #SN Attr   VSize   VFree
>   clientstore   1   3   0 wz--n- 148.98G 23.98G
> Wombat:~# pvs
>   PV         VG          Fmt  Attr PSize   PFree
>   /dev/sda2  clientstore lvm2 a-   148.98G 23.98G
> Wombat:~# lvcreate -L10G -n snapdisk -s /dev/clientstore/userdisk
>   LV clientstore/snapdisk in use: not deactivating
>   Couldn't deactivate new snapshot.
> Wombat:~# lvs
>   LV          VG          Attr   LSize  Origin Snap%  Move Log Copy%
>   backupimage clientstore -ri-ao 60.00G
>   root        clientstore -wi-ao  5.00G
>   snapdisk    clientstore -wi-a- 10.00G
>   userdisk    clientstore -wi-ao 60.00G
> Wombat:~#
> 
> 
> Many thanks in advance,
> 
> Roger
> 
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