Xen users - Sep 2008 - Howto made LVM2 snapshots of my whole HVM domU disk, not per partition.

Hi!

 In my dom0, I have two logical volumes for my virtualized Windows 2003
Servers, each of with it''s your own partitions, let''s see:

 I have this lvm volume "/dev/mapper/HyperVG01-windows01-disk1" is
"phy:/dev/mapper/HyperVG01-windows01-disk1,hda,w" and
"/dev/mapper/HyperVG01-windows01-disk2" is
"phy:/dev/mapper/HyperVG01-windows01-disk2,hdb,w" in my
/etc/xen/windows01-dm.

 So I have Windows working in a new HVM stubdomain. But how can I made a
entire backup of my disks, including my Windows boot loader and move my
Windows to another Hypervisor?

 I have tried:
1) xm shutdown windows01;
2) dd if=/dev/mapper/HyperVG01-windows01-disk1
of=/var/backups/windows01-disk1.dd
2) dd if=/dev/mapper/HyperVG01-windows01-disk2
of=/var/backups/windows01-disk2.dd
3) move windows01-disk1.dd and windows01-disk2 to another Hypervisor and do
inverse dd;
4) xm create windows01-stubdom on the new Hypervisor;

 This sometimes works, sometimes not!
 Every time I do this, my Windows boot''s ok but my hdb
(windows01-disk2)
always came corrupted... I don''t know why one volume wokrs and other
don''t...
 I have the same size for HyperVG01-windows01-diskX on both dom0s...

 I do NOT want to use kpartx or ntfs-3g from my dom0 to read NTFS from
Linux. I want a backup of whole disk.

 Can I do this with snapshots:
1) "xm pause windows01" or "xm shutdown windows01";
2) lvcreate -s windows01-disk1-snapshot
/dev/mapper/HyperVG01-windows01-disk1
3) "xm unpause windows01" or "xm create
/etc/xen/windows01-stubdom";
4) Made a backup using my snapshot. ?

Next time when I restore from snapshot Windows will work without erros?

Can I take a "disk" snapshot of running HVM (With Windows guest) while
it''s
still alive?

Chears,
Thiago


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2008. 09. 16, kedd keltezéssel 20.00-kor Thiago Camargo Martins Cordeiro
ezt írta:
> This Windows GPL PV drivers are still beta, they works with new
> Xen-3.3.0 ?
I think that version is beta, but you may find a newer version. I don''t
know if it works on xen 3.3.0
> I''m allways do a safe Windows shutdown via Windows menus before
taking
> a snapshot, just to be clearified...    :)
> 
> But even with Windows guest down, my steps don''t work when I try
to
> restore on another hypervisor...
> 
> I will try Ghost to move my Windows... If I can''t do it with
> lvm/snapshots and dd.
> 
> If you have a better idea, I hear you!
I really have no idea why it doesn'' work after a clean shutdown.

cheers

Tamas


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Hi,

 After start from zero, dd works 100% and I move my virtualized Windows to
another Hypervisor!

 Thank you!

Best regards,

Thiago

2008/9/16 Németh Tamás <nice@titanic.nyme.hu>
> 2008. 09. 16, kedd keltezéssel 20.00-kor Thiago Camargo Martins Cordeiro
> ezt írta:
> > This Windows GPL PV drivers are still beta, they works with new
> > Xen-3.3.0 ?
>
> I think that version is beta, but you may find a newer version. I
don''t
> know if it works on xen 3.3.0
>
> > I''m allways do a safe Windows shutdown via Windows menus
before taking
> > a snapshot, just to be clearified...    :)
> >
> > But even with Windows guest down, my steps don''t work when I
try to
> > restore on another hypervisor...
> >
> > I will try Ghost to move my Windows... If I can''t do it with
> > lvm/snapshots and dd.
> >
> > If you have a better idea, I hear you!
>
> I really have no idea why it doesn'' work after a clean shutdown.
>
> cheers
>
> Tamas
>
>

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Glad to hear you got this solved.
 
I’m curious, though.  Why pause the guest domain before creating a snapshot? 
This doesn’t make the snapshot any more consistent…
 
Thank you,
Nathan Eisenberg
Sr. Systems Administrator
Atlas Networks, LLC.
 
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Thiago Camargo
Martins Cordeiro
Sent: Tuesday, September 16, 2008 3:15 PM
To: xen-users
Subject: [Xen-users] Howto made LVM2 snapshots of my whole HVM domU disk, not
per partition.
 
Hi!

 In my dom0, I have two logical volumes for my virtualized Windows 2003 Servers,
each of with it''s your own partitions, let''s see:

 I have this lvm volume "/dev/mapper/HyperVG01-windows01-disk1" is
"phy:/dev/mapper/HyperVG01-windows01-disk1,hda,w" and
"/dev/mapper/HyperVG01-windows01-disk2" is
"phy:/dev/mapper/HyperVG01-windows01-disk2,hdb,w" in my
/etc/xen/windows01-dm.

 So I have Windows working in a new HVM stubdomain. But how can I made a entire
backup of my disks, including my Windows boot loader and move my Windows to
another Hypervisor?

 I have tried:
1) xm shutdown windows01;
2) dd if=/dev/mapper/HyperVG01-windows01-disk1
of=/var/backups/windows01-disk1.dd
2) dd if=/dev/mapper/HyperVG01-windows01-disk2
of=/var/backups/windows01-disk2.dd
3) move windows01-disk1.dd and windows01-disk2 to another Hypervisor and do
inverse dd;
4) xm create windows01-stubdom on the new Hypervisor;

 This sometimes works, sometimes not!
 Every time I do this, my Windows boot''s ok but my hdb
(windows01-disk2) always came corrupted... I don''t know why one volume
wokrs and other don''t...
 I have the same size for HyperVG01-windows01-diskX on both dom0s...

 I do NOT want to use kpartx or ntfs-3g from my dom0 to read NTFS from Linux. I
want a backup of whole disk.

 Can I do this with snapshots:
1) "xm pause windows01" or "xm shutdown windows01";
2) lvcreate -s windows01-disk1-snapshot /dev/mapper/HyperVG01-windows01-disk1
3) "xm unpause windows01" or "xm create
/etc/xen/windows01-stubdom";
4) Made a backup using my snapshot. ?

Next time when I restore from snapshot Windows will work without erros?

Can I take a "disk" snapshot of running HVM (With Windows guest) while
it''s still alive?

Chears,
Thiago

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On Wed, Sep 17, 2008 at 3:50 AM, Nathan Eisenberg
<nathan@atlasnetworks.us> wrote:
> I'm curious, though.  Why pause the guest domain before creating a
> snapshot?  This doesn't make the snapshot any more consistent…
if there are more than one block device, you have to pause to get them
all at the same 'instant'



-- 
Javier

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