9:22 a.m.
Hello,
I have a windows 7 VM that is composed by a raw disk on filesystem on
Fedora 28.
I would like to transfer this VM to another environment, always based on
same version of Fedora 28, but where the storage is configured in
virt-manager as lvm based, so similar to what happens in oVirt block based
storage domains.
I'm trying to figure how to transfer the image.
I presume I can create a new LV and then leave some bytes for the LVM
header into the created LV and then make a sort of dd with offset?
Anyone has any hint?
Thanks in advance,
Gianluca
9:28 a.m.
New subject: [OT] transferring kvm raw mage from filesystem to lvm based
Hello,
i migrated a vm from plain kvm to ovirt fc storage domain by creating
an empty disk of the required size and using qemu-img for converting
from the image file to the device.
Worked well.
Luca
On Fri, Jul 27, 2018 at 4:22 PM Gianluca Cecchi
<gianluca.cecchi(a)gmail.com> wrote:
Hello,
I have a windows 7 VM that is composed by a raw disk on filesystem on Fedora 28.
I would like to transfer this VM to another environment, always based on same version of
Fedora 28, but where the storage is configured in virt-manager as lvm based, so similar to
what happens in oVirt block based storage domains.
I'm trying to figure how to transfer the image.
I presume I can create a new LV and then leave some bytes for the LVM header into the
created LV and then make a sort of dd with offset?
Anyone has any hint?
Thanks in advance,
Gianluca
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Luca 'remix_tj' Lorenzetto, http://www.remixtj.net ,
<lorenzetto.luca(a)gmail.com>
10:34 a.m.
New subject: [OT] transferring kvm raw mage from filesystem to lvm based
On Fri, Jul 27, 2018 at 4:28 PM, Luca 'remix_tj' Lorenzetto <
lorenzetto.luca(a)gmail.com> wrote:
Hello,
i migrated a vm from plain kvm to ovirt fc storage domain by creating
an empty disk of the required size and using qemu-img for converting
from the image file to the device.
Worked well.
Luca
Thanks for the hint Lorenzo!
In my case both source and target are plain qemu/kvm environments basically
managed with virt-manager/virsh
The source image:
[root@skull01 ~]# qemu-img info /images/w7/w7.img
image: /images/w7/w7.img
file format: raw
virtual size: 49G (52613349376 bytes)
disk size: 49G
[root@skull01 ~]#
It was simpler than expected, after creating from inside virt-manager of
the new environment a new disk (so it translates into a new lv) of 50Gb in
size, I have now:
[root@skull01 ~]# lvs data/w7
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync
Convert
w7 data -wi-ao---- 50.00g
[root@skull01 ~]#
And then:
[root@skull01 ~]# time qemu-img convert -f raw -O raw /images/w7/w7.img
/dev/data/w7
real 13m27.934s
user 0m5.312s
sys 0m51.342s
[root@skull01 ~]#
At the end of the convert I defined the new domain with
virsh define w7.xml
using as input the xml file of the original system and adjusted the new
obtained xml file with "virsh edit w7"
Mainly the differences between new and original xml files become:
42,44c43,45
< <disk type='block' device='disk'>
< <driver name='qemu' type='raw' cache='none'
io='native'/>
< <source dev='/dev/data/w7'/>
---
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/var/lib/libvirt/images/w7.img'/>
72c73
< <source network='nat'/>
---
<source network='default'/>
The target environment didn't complain after starting the guest, apart from
asking to confirm the new network to be a home one or a public one... not
understood exactly why, but I'm on the go now
Thanks again,
Gianluca
1:59 p.m.
New subject: [OT] transferring kvm raw mage from filesystem to lvm based
On Fri, Jul 27, 2018 at 6:37 PM Gianluca Cecchi <gianluca.cecchi(a)gmail.com>
wrote:
...
And then:
[root@skull01 ~]# time qemu-img convert -f raw -O raw /images/w7/w7.img
/dev/data/w7
When converting to raw format on block device, you should use -W option for
up to 6.5x
faster convert.
See https://bugzilla.redhat.com/show_bug.cgi?id=1511891#c57
Nir
real 13m27.934s
user 0m5.312s
sys 0m51.342s
[root@skull01 ~]#
2273
days inactive
2340
days old
3 comments
3 participants
participants (3)
-
Gianluca Cecchi -
Luca 'remix_tj' Lorenzetto -
Nir Soffer