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Re: [Xen-devel] Re: [Xen-users] XCP/XenServer Migration utility now available at xen.org
If /dev/xvda is mounted on / then it would just be a matter of doing resize2fs /dev/xvda.
Furthermore you dont suffer from block misalignment, but thats another days conversation.
2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
Mmmm... Good point but, the LVM within the domU is very useful if you resize (append more blocks to the xvda) the virtual disc... Don't you think?!2010/3/15 David Markey <admin@xxxxxxxxxxx>
Well,
The partition scheme in your VM is the same before and after the migration.
I think any different behaviour is outside the scope of this tool I think.
And LVM within a DomU is of limited value anyway :)
2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
Okay!
Well, since you asked for a feature request! Here's one!
* Allow re-create the partition scheme.
Cheers! :-DThiago 2010/3/15 David Markey <admin@xxxxxxxxxxx>
If your OSS Xen VMs don't have LVM, then they wont have LVM in XenServer after they are migrated.
2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
Okay but, and my partition scheme?
Remember that within the XenServer, my domUs have its own LVM...
I can change the fstab and grub's menu files before run xva.py but, how to make the partitions and the LVM vg / lv on the new domU?
2010/3/15 David Markey <admin@xxxxxxxxxxx>
Sorry,sed -i.bak -e 's/xvda1/xvda/g' -e 's/xvda2/xvdb/g' /mnt/tmp/etc/fstab /mnt/tmp/boot/grub/menu.lst (or grub.conf)
2010/3/15 David Markey <admin@xxxxxxxxxxx>
No im afraid not.
YOU have to make these changes to menu.lst and fstab before migration.
If your VMs are the exact same, this should be easily scripted. i.e.
vmdisk="/dev/xen/vm1root"
mount $vmdisk /mnt/tmp
sed -i.bak -e 's/xvda1/xvda/g' -e 's/xvda2/xvdb/g' /mnt/tmp/etc/fstab /mnt/tmp/etc/fstab
umount /mnt/tmp
2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
So, your script can make a new partition scheme and a new fstab for my VMs before stream it to the XenServer?
Because I have more than 100 VMs to copy! :-/
2010/3/15 David Markey <admin@xxxxxxxxxxx>
Wow, what a pain :)
2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
Yeah! Sure!
Today I'm doing this work manually... I mean, to copy a VM from open source Xen to the XenServer I do:
1- stop the VM on my debian dom0;
2- mount its root file system under /mnt/source;
3- export it via NFS;
4- At the XenServer, I boot the sysrescuecd (a live system);
5- fdisk the /dev/sda;
6- create the LVM volumes;
7- mount /dev/vg01/root under /mnt/target;
8- mount /dev/sda1 under /mnt/target/boot;
9- mount the debian dom0 nfs server under /mnt/source;
10- cp /mnt/source/* /mnt/target/
11- edit the /etc/fstab and the grub's menu;
12- shutdown the VM;
13- Convert it from HVM to PVM;
14- start the VM;
Thanks, Thiago 2010/3/15 David Markey <admin@xxxxxxxxxxx>
If you change xvda1 to xvda, change xvda2 to xvdb it will work fine.
Change references in /boot/grub/menu.lst of xvda1 to xvda
Change references in /etc/fstab of xvda1 to xvda, and xvda2 to xvdb.
Understand? 2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
Exactly!
The first one is for my domU hosted at my open source Xen (powered by Debian), the second fstab, is the new one, used for my guests hosted at my XenServers.
Thanks! Thiago
2010/3/15 David Markey <admin@xxxxxxxxxxx>
I'm confused,
You supply 2 fstabs there, one using LVM, one without. Which one is it?
2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
Hi David!
My Xen domU in my open source dom0 (Debian) have this configuration file:
----
bootloader = '/usr/bin/pygrub'
extra = 'console=hvc0'
memory = '64'
disk = [
'phy:/dev/HyperVG01/guest01-root,xvda1,w',
'phy:/dev/HyperVG01/guest01-swap,xvda2,w',
]
name = 'guest01'
vif = [ 'mac=00:01:64:4b:0d:2e, vifname=guest01-eth0, bridge=eth0' ]
>on_reboot = 'restart'
on_crash = 'restart'
----
My guest01 /etc/fstab file:
proc /proc proc defaults 0 0
/dev/xvda1 / ext3 relatime,errors=remount-ro 0 1
/dev/xvda2 none swap sw 0 0
BUT, this is for open source Xen domU, within the XenServer, the guest01 should be:
proc /proc proc defaults 0 0
/dev/xvda1 /boot ext2 defaults 0 2
/dev/mapper/vdwuaf1-root / ext3 errors=remount-ro
0 1
/dev/mapper/vdwuaf1-swap_1 none swap sw 0 0
And the partition table of the guest01:
guest01:~# fdisk -lu /dev/xvda
Disk /dev/xvda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x0009c181
Device Boot Start End Blocks Id System
/dev/xvda1 * 63 498014 248976 83 Linux
/dev/xvda2 498015 16771859 8136922+ 8e Linux LVM
You tool can recreate the partition scheme? Or it just copy the domU as is?
I have many others domU like this to copy...
Thanks!
Thiago
2010/3/15 David Markey <admin@xxxxxxxxxxx>
If anyone has feature requests, direct them here.
The next feature i'll be working on is supporting kernels loaded from the Dom0. The kernel images will have to be copied to the XenServer/XCP Dom0.
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