[pve-devel] [PATCH v5 qemu-server 0/3] remote-migration: migration with different cpu
DERUMIER, Alexandre
alexandre.derumier at groupe-cyllene.com
Fri Nov 17 09:52:09 CET 2023
Hi,
Any chance to have it one merged for 8.1 ?
-------- Message initial --------
De: Alexandre Derumier <aderumier at odiso.com>
Répondre à: Proxmox VE development discussion <pve-
devel at lists.proxmox.com>
À: pve-devel at lists.proxmox.com
Objet: [pve-devel] [PATCH v5 qemu-server 0/3] remote-migration:
migration with different cpu
Date: 26/10/2023 10:57:07
This patch series allow remote migration between cluster with different
cpu model.
2 new params are introduced: "target-cpu" && "restart"
If target-cpu is defined, this will replace the cpu model of the target
vm.
If vm is online/running, an extra "target-reboot" safeguard option is
needed.
Indeed, as the target cpu is different, the live migration with memory
transfert
is skipped (as anyway, the target will die with a different cpu).
Then, after the storage copy, we switch source vm disk to the targetvm
nbd export,
then shutdown the source vm and restart the target vm.
(Like a virtual reboot between source/target)
We have redone a lot of migration this summer( maybe another 4000vm),
0 corruption, windows or linux guest vms.
Changelog v2:
The first version was simply shuting down the target vm,
wihout doing the block-job-complete.
After doing production migration with around 400vms, I had
some fs corruption, like some datas was still in buffer.
This v2 has been tested with another 400vms batch, without
any corruption.
Changelog v3:
v2 was not perfect, still have some 1 or 2 fs corruption with vms doing
a lot of write.
This v3 retake idea of the v1 but in a cleaner way
- we migrate disk to target vm
- source vm is switching disk to the nbd of the target vm.
(with a block-job-complete, and not a block-job-cancel with standard
disk migration).
We are 100% sure it that no pending write is still pending in the
migration job.
- source vm is shutdown
- target with is restart
Changelog v4:
- bugfix: no not override cpu with empty config if targetcpu is not
defined
- small cleanups with params
Changelov V5:
- Fix fiona comments
- use "restart" param instead "target-reboot"
- split target-cpu param in separated patch
Alexandre Derumier (3):
migration: move livemigration code in a dedicated sub
remote-migration: add restart param
add target-cpu param
PVE/API2/Qemu.pm | 26 +++
PVE/CLI/qm.pm | 12 ++
PVE/QemuMigrate.pm | 452 ++++++++++++++++++++++++---------------------
3 files changed, 281 insertions(+), 209 deletions(-)
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