Amount of virtual disks with KVM
Hi all!
I'm trying to make a migration of a Xen PV virtual machine to KVM. For this I'm starting a VM with SystemRescueCD [1] of the following way:
# /usr/local/kvm/bin/qemu-system-x86_64 -hda /dev/vm/hermes-disk -boot d \ -cdrom /space/isos/systemrescuecd-x86-1.3.2.iso -m 512 -daemonize -vnc \ :2 -k es -localtime -hdb hermes-raiz.raw -hdc hermes-var.raw -net \ nic,vlan=0,macaddr=00:16:3e:00:00:34 -net tap
Where hermes-disk is the disk that will use the VM in the destination host, and hermes-raiz.raw and hermes-var.raw are the raw partitions that was using the Xen PV virtual machine in source host.
My idea is to create the partitions in hermes-disk, to mount the raw partitions and to do "cp -a" to the partitions created in hermes-disk, but after boot only hermes-disk and hermes-raiz.raw are exported (like sda and sdb). Which can be the problem?
Using VIRTIO for the raw partitions I didn't have this problem.
Something similar happened to me with a ISO of Debian netinstall. It doesn't boot passing three disks with -hdX. But making the installation with netinstall and two disks and after it have finished and have booted and added a third disk, the system boots without problems. Will it be by the same cause?
Thanks in advance for your reply.
Regards,
Daniel
[1] http://www.sysresccd.org/Main_Page
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Quoted 10 lines · Daniel Bareiro
Hi all!
I'm trying to make a migration of a Xen PV virtual machine to KVM. For this I'm starting a VM with SystemRescueCD [1] of the following way:
# /usr/local/kvm/bin/qemu-system-x86_64 -hda /dev/vm/hermes-disk -boot d \ -cdrom /space/isos/systemrescuecd-x86-1.3.2.iso -m 512 -daemonize -vnc \ :2 -k es -localtime -hdb hermes-raiz.raw -hdc hermes-var.raw -net \ nic,vlan=0,macaddr=00:16:3e:00:00:34 -net tap
Quoted 10 lines
Where hermes-disk is the disk that will use the VM in the destination host, and hermes-raiz.raw and hermes-var.raw are the raw partitions that was using the Xen PV virtual machine in source host.
My idea is to create the partitions in hermes-disk, to mount the raw partitions and to do "cp -a" to the partitions created in hermes-disk, but after boot only hermes-disk and hermes-raiz.raw are exported (like sda and sdb). Which can be the problem?
-cdrom and -hdc occupy the same IDE slot (second bus, master drive). Try -hdd instead of -hdc.
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Do not meddle in the internals of kernels, for they are subtle and quick to panic.
Hi, Avi.
Quoted 13 lines · Avi Kivity
Quoted 13 lines
I'm trying to make a migration of a Xen PV virtual machine to KVM. For this I'm starting a VM with SystemRescueCD [1] of the following way:
# /usr/local/kvm/bin/qemu-system-x86_64 -hda /dev/vm/hermes-disk -boot d \ -cdrom /space/isos/systemrescuecd-x86-1.3.2.iso -m 512 -daemonize -vnc \ :2 -k es -localtime -hdb hermes-raiz.raw -hdc hermes-var.raw -net \ nic,vlan=0,macaddr=00:16:3e:00:00:34 -net tapWhere hermes-disk is the disk that will use the VM in the destination host, and hermes-raiz.raw and hermes-var.raw are the raw partitions that was using the Xen PV virtual machine in source host.
Quoted 7 lines
Quoted 4 lines
My idea is to create the partitions in hermes-disk, to mount the raw partitions and to do "cp -a" to the partitions created in hermes-disk, but after boot only hermes-disk and hermes-raiz.raw are exported (like sda and sdb). Which can be the problem?
-cdrom and -hdc occupy the same IDE slot (second bus, master drive). Try -hdd instead of -hdc.
Perfect! With -hdd and -cdrom, it exported the three disks and the ISO without problems. That would also explain why when not using -cdrom, the -hdc disk yes it is exported after to have installed with netinstall.
Thanks for your reply.
Regards,
Daniel
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Fingerprint: BFB3 08D6 B4D1 31B2 72B9 29CE 6696 BF1B 14E6 1D37 Powered by Debian GNU/Linux Squeeze - Linux user #188.598